diff --git a/.gitignore b/.gitignore
index 717bd12d..37d8b4c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,3 +37,5 @@ waf3*/
 .vscode/
 .depproj/
 source-engine.sln
+hl2/
+
diff --git a/appframework/glmdisplaydb_linuxwin.inl b/appframework/glmdisplaydb_linuxwin.inl
index daa28d85..fe743b19 100644
--- a/appframework/glmdisplaydb_linuxwin.inl
+++ b/appframework/glmdisplaydb_linuxwin.inl
@@ -631,8 +631,8 @@ void    GLMDisplayInfo::Dump( int which )
 {
         SDLAPP_FUNC;
 
-        GLMPRINTF(("\n         #%d: GLMDisplayInfo @ %08x, pixwidth=%d  pixheight=%d",
-                           which, (int)this,  m_info.m_displayPixelWidth,  m_info.m_displayPixelHeight ));
+        GLMPRINTF(("\n         #%d: GLMDisplayInfo @ %p, pixwidth=%d  pixheight=%d",
+                           which, this,  m_info.m_displayPixelWidth,  m_info.m_displayPixelHeight ));
 
         FOR_EACH_VEC( *m_modes, i )
         {
diff --git a/appframework/sdlmgr.cpp b/appframework/sdlmgr.cpp
index 5c820f6f..84de467c 100644
--- a/appframework/sdlmgr.cpp
+++ b/appframework/sdlmgr.cpp
@@ -270,7 +270,7 @@ public:
 
 	// Get the next N events. The function returns the number of events that were filled into your array.
 	virtual int GetEvents( CCocoaEvent *pEvents, int nMaxEventsToReturn, bool debugEvents = false );
-#ifdef LINUX
+#if defined(LINUX) || defined(BSD)
 	virtual int PeekAndRemoveKeyboardEvents( bool *pbEsc, bool *pbReturn, bool *pbSpace, bool debugEvent = false );
 #endif
 
@@ -1004,7 +1004,7 @@ int CSDLMgr::GetEvents( CCocoaEvent *pEvents, int nMaxEventsToReturn, bool debug
 	return nToWrite;
 }
 
-#ifdef LINUX
+#if defined(LINUX) || defined(BSD)
 
 int CSDLMgr::PeekAndRemoveKeyboardEvents( bool *pbEsc, bool *pbReturn, bool *pbSpace, bool debugEvent )
 {
diff --git a/common/freetype/config/ftconfig.h b/common/freetype/config/ftconfig.h
index 200dd57f..f83aa8db 100644
--- a/common/freetype/config/ftconfig.h
+++ b/common/freetype/config/ftconfig.h
@@ -3,7 +3,7 @@
 
 #ifdef ANDROID
 #include <sys/cdefs.h>
-#elif defined(OSX)
+#elif defined(OSX) || defined(BSD)
 #include <stdint.h>
 #else
 #include <bits/wordsize.h>
diff --git a/common/vgui_surfacelib/FontManager.h b/common/vgui_surfacelib/FontManager.h
index 0d7d1e58..b6b10b81 100644
--- a/common/vgui_surfacelib/FontManager.h
+++ b/common/vgui_surfacelib/FontManager.h
@@ -17,7 +17,7 @@
 #include "filesystem.h"
 #include "vguifont.h"
 
-#if defined(LINUX) || defined(OSX)
+#ifdef POSIX
 #include <ft2build.h>
 #include FT_FREETYPE_H
 typedef void *(*FontDataHelper)( const char *pchFontName, int &size, const char *fontFileName );
@@ -71,7 +71,7 @@ public:
 	IFileSystem *FileSystem() { return m_pFileSystem; }
 	IMaterialSystem *MaterialSystem() { return m_pMaterialSystem; }
 
-#if defined(LINUX) || defined(OSX)
+#ifdef POSIX
 	FT_Library GetFontLibraryHandle() { return library; }
 	void SetFontDataHelper( FontDataHelper helper ) { m_pFontDataHelper = helper; }
 #endif
@@ -96,7 +96,7 @@ private:
 	CUtlVector<CFontAmalgam> m_FontAmalgams;
 	CUtlVector<font_t *> m_Win32Fonts;
 
-#if defined(LINUX) || defined(OSX)
+#ifdef POSIX
 	FT_Library library; 
 	FontDataHelper m_pFontDataHelper;
 #endif
diff --git a/common/vgui_surfacelib/vguifont.h b/common/vgui_surfacelib/vguifont.h
index 02374f36..0ab9cd44 100644
--- a/common/vgui_surfacelib/vguifont.h
+++ b/common/vgui_surfacelib/vguifont.h
@@ -23,7 +23,7 @@ struct newChar_t
 #ifdef WIN32
 #include "Win32Font.h"
 typedef CWin32Font font_t;
-#elif defined(LINUX) || defined(OSX)
+#elif defined(POSIX)
 #include "linuxfont.h"
 typedef CLinuxFont font_t;
 #else
@@ -31,4 +31,4 @@ typedef CLinuxFont font_t;
 #endif
 
 
-#endif //VGUIFONT_H 
\ No newline at end of file
+#endif //VGUIFONT_H 
diff --git a/engine/bugreporter.cpp b/engine/bugreporter.cpp
index 25a5b4f3..1caf4fcf 100644
--- a/engine/bugreporter.cpp
+++ b/engine/bugreporter.cpp
@@ -20,6 +20,11 @@
 #include <copyfile.h>
 #import <mach/mach_host.h>
 #import <sys/sysctl.h>
+#elif defined(BSD)
+# include <sys/sysctl.h>
+# include <sys/types.h>
+# include <fcntl.h>
+# define HW_MEMSIZE HW_PHYSMEM
 #elif defined(LINUX)
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -105,7 +110,7 @@
 #define BUG_REPOSITORY_URL "\\\\fileserver\\bugs"
 #elif defined(OSX)
 #define BUG_REPOSITORY_URL "/Volumes/bugs"
-#elif defined(LINUX)
+#elif defined(LINUX) || defined(BSD)
 #define BUG_REPOSITORY_URL "\\\\fileserver\\bugs"
 #else
 //#error
@@ -139,7 +144,7 @@ unsigned long GetRam()
 	MEMORYSTATUS stat;
 	GlobalMemoryStatus( &stat );
 	return (stat.dwTotalPhys / (1024 * 1024));
-#elif defined(OSX)
+#elif defined(OSX) || defined(BSD)
 	int mib[2] = { CTL_HW, HW_MEMSIZE };
 	u_int namelen = sizeof(mib) / sizeof(mib[0]);
 	uint64_t memsize;
@@ -340,6 +345,12 @@ void DisplaySystemVersion( char *osversion, int maxlen )
 
 		fclose( fpKernelVer );
 	}
+#elif BSD
+  #ifdef __FreeBSD__
+    osversion = (char *)"FreeBSD";
+  #else
+    osversion = (char *)"*BSD";
+  #endif
 #endif
 }
 
@@ -2246,7 +2257,7 @@ void NonFileSystem_CreatePath (const char *path)
 	}
 }
 
-#ifdef LINUX
+#if defined(LINUX) || defined(BSD)
 #define COPYFILE_ALL 0
 #define BSIZE 65535
 int copyfile( const char *local, const char *remote, void *ignored, int ignoredFlags )
diff --git a/engine/host.cpp b/engine/host.cpp
index 9ddc96b6..9ebdc928 100644
--- a/engine/host.cpp
+++ b/engine/host.cpp
@@ -3947,7 +3947,7 @@ bool DLL_LOCAL Host_IsValidSignature( const char *pFilename, bool bAllowUnknown
 #if defined( SWDS ) || defined(_X360)
 	return true;
 #else
-	if ( sv.IsDedicated() || IsOSX() || IsLinux() )
+	if ( sv.IsDedicated() || IsOSX() || IsLinux() || IsBSD() )
 	{
 		// dedicated servers and Mac and Linux  binaries don't check signatures
 		return true;
diff --git a/engine/sv_main.cpp b/engine/sv_main.cpp
index 58c395ed..000da522 100644
--- a/engine/sv_main.cpp
+++ b/engine/sv_main.cpp
@@ -2714,6 +2714,14 @@ bool CGameServer::SpawnServer( const char *szMapName, const char *szMapFile, con
 		event->SetString( "os", "LINUX" );
 #elif defined ( OSX )
 		event->SetString( "os", "OSX" );
+#elif defined(BSD)
+    event->SetString("os",
+#    ifdef __FreeBSD__
+      "FreeBSD"
+#    else
+      "BSD"
+#    endif
+    );
 #else
 #error
 #endif
diff --git a/engine/sv_uploadgamestats.cpp b/engine/sv_uploadgamestats.cpp
index f4836600..01c110bf 100644
--- a/engine/sv_uploadgamestats.cpp
+++ b/engine/sv_uploadgamestats.cpp
@@ -21,9 +21,10 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 //$ #include <uuid/uuid.h>
-typedef unsigned char uuid_t[16];
 #ifdef OSX
 #include <uuid/uuid.h>
+#elif defined(BSD)
+#include <uuid.h>
 #else
 typedef unsigned char uuid_t[16];
 #endif
@@ -397,6 +398,9 @@ public:
 			uuid_t newId;
 #ifdef OSX
 			uuid_generate( newId );
+#elif defined(BSD)
+			uint32_t status;
+			uuid_create( &newId, &status );
 #endif
 #else
 #error
diff --git a/engine/sys_dll.cpp b/engine/sys_dll.cpp
index 2d8b30e2..04ff6689 100644
--- a/engine/sys_dll.cpp
+++ b/engine/sys_dll.cpp
@@ -12,6 +12,10 @@
 #elif defined(OSX)
 #include <Carbon/Carbon.h>
 #include <sys/sysctl.h>
+#elif defined(BSD)
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#define HW_MEMSIZE HW_PHYSMEM
 #endif
 #if defined(LINUX)
 #include <unistd.h>
@@ -456,21 +460,14 @@ void Sys_Error_Internal( bool bMinidump, const char *error, va_list argsList )
 
 			// We always get here because the above filter evaluates to EXCEPTION_EXECUTE_HANDLER
 		}
-#elif defined( OSX )
+#elif defined(POSIX)
 		// Doing this doesn't quite work the way we want because there is no "crashing" thread
 		// and we see "No thread was identified as the cause of the crash; No signature could be created because we do not know which thread crashed" on the back end
 		//SteamAPI_WriteMiniDump( 0, NULL, build_number() );
 		printf("\n ##### Sys_Error: %s", text );
 		fflush(stdout );
 
-		int *p = 0;
-		*p = 0xdeadbeef;
-#elif defined( LINUX )
-		// Doing this doesn't quite work the way we want because there is no "crashing" thread
-		// and we see "No thread was identified as the cause of the crash; No signature could be created because we do not know which thread crashed" on the back end
-		//SteamAPI_WriteMiniDump( 0, NULL, build_number() );
-		int *p = 0;
-		*p = 0xdeadbeef;
+		raise(SIGTRAP);
 #else
 #warning "need minidump impl on sys_error"
 #endif
@@ -671,7 +668,7 @@ void Sys_InitMemory( void )
 #elif defined(POSIX)
 	uint64_t memsize = ONE_HUNDRED_TWENTY_EIGHT_MB;
 
-#if defined(OSX)
+#if defined(OSX) || defined(BSD)
 	int mib[2] = { CTL_HW, HW_MEMSIZE };
 	u_int namelen = sizeof(mib) / sizeof(mib[0]);
 	size_t len = sizeof(memsize);
@@ -1589,7 +1586,9 @@ CON_COMMAND( star_memory, "Dump memory stats" )
 	struct mstats memstats = mstats( );
 	Msg( "Available %.2f MB, Used: %.2f MB, #mallocs = %lu\n",
 		 memstats.bytes_free / ( 1024.0 * 1024.0), memstats.bytes_used / ( 1024.0 * 1024.0 ), memstats.chunks_used );
-#else
+#elif BSD
+# warning TODO: Implement memory stats (peace of sheet of course)
+#else // Win32
 	MEMORYSTATUS stat;
 	GlobalMemoryStatus( &stat );
 	Msg( "Available: %.2f MB, Used: %.2f MB, Free: %.2f MB\n", 
diff --git a/engine/sys_dll2.cpp b/engine/sys_dll2.cpp
index 087d398e..0a65cbd0 100644
--- a/engine/sys_dll2.cpp
+++ b/engine/sys_dll2.cpp
@@ -15,7 +15,7 @@
 #include <Psapi.h>
 #endif
 
-#if defined( OSX )
+#if defined( OSX ) || defined(BSD)
 #include <sys/sysctl.h>
 #endif
 
@@ -278,7 +278,7 @@ static void posix_signal_handler( int i )
 #define DO_TRY		if ( sigsetjmp( g_mark, 1 ) == 0 )
 #define DO_CATCH	else
 
-#if defined( OSX )
+#if defined( OSX ) || defined(BSD)
 #define __sighandler_t sig_t
 #endif
 
@@ -537,7 +537,7 @@ public:
 			FreeLibrary( hInst );
 		}
 
-#elif defined( OSX )
+#elif defined( OSX ) || defined(BSD)
 
 		static const struct
 		{
@@ -548,8 +548,13 @@ public:
 		#define _XTAG( _x ) { _x, #_x }
 			_XTAG( HW_PHYSMEM ),
 			_XTAG( HW_USERMEM ),
+#ifdef BSD
+			_XTAG( HW_PHYSMEM ),
+			_XTAG( HW_NCPU ),
+#else
 			_XTAG( HW_MEMSIZE ),
 			_XTAG( HW_AVAILCPU ),
+#endif
 		#undef _XTAG
 		};
 
diff --git a/engine/sys_mainwind.cpp b/engine/sys_mainwind.cpp
index c3bb3acf..b8fc98d7 100644
--- a/engine/sys_mainwind.cpp
+++ b/engine/sys_mainwind.cpp
@@ -25,7 +25,7 @@
 #elif defined(_X360)
 	// nothing to include for 360
 #elif defined(OSX)
-#elif defined(LINUX)
+#elif defined(LINUX) || defined(BSD)
 	#include "tier0/dynfunction.h"
 #elif defined(_WIN32)
 	#include "tier0/dynfunction.h"
@@ -833,11 +833,7 @@ LRESULT CGame::WindowProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
     // return 0 if handled message, 1 if not
     return lRet;
 }
-#elif defined(OSX)
-
-#elif defined(LINUX)
-
-#elif defined(_WIN32)
+#elif defined(OSX) || defined(LINUX) || defined(_WIN32) || defined(BSD)
 
 #else
 #error
diff --git a/filesystem/basefilesystem.cpp b/filesystem/basefilesystem.cpp
index 16179b9b..35f34f23 100644
--- a/filesystem/basefilesystem.cpp
+++ b/filesystem/basefilesystem.cpp
@@ -2841,7 +2841,7 @@ time_t CBaseFileSystem::FastFileTime( const CSearchPath *path, const char *pFile
 		{
 			return buf.st_mtime;
 		}
-#ifdef LINUX
+#if defined(LINUX) || defined(BSD)
 		char caseFixedName[ MAX_PATH ];
 		bool found = findFileInDirCaseInsensitive_safe( pTmpFileName, caseFixedName );
 		if ( found && FS_stat( caseFixedName, &buf ) != -1 )
diff --git a/filesystem/filesystem_async.cpp b/filesystem/filesystem_async.cpp
index adce661c..27216b74 100644
--- a/filesystem/filesystem_async.cpp
+++ b/filesystem/filesystem_async.cpp
@@ -1527,7 +1527,7 @@ void CBaseFileSystem::DoAsyncCallback( const FileAsyncRequest_t &request, void *
 	if ( pDataToFree  )
 	{
 		Assert( !request.pfnAlloc );
-#if defined( OSX ) || defined( LINUX )
+#if defined( OSX ) || defined( LINUX ) || defined(BSD)
 		// The ugly delete[] (void*) method generates a compile warning on osx, as it should.
 		free( pDataToFree );
 #else
diff --git a/filesystem/filesystem_stdio.cpp b/filesystem/filesystem_stdio.cpp
index 3bb7c5b5..dcb9ad9d 100644
--- a/filesystem/filesystem_stdio.cpp
+++ b/filesystem/filesystem_stdio.cpp
@@ -579,7 +579,7 @@ int CFileSystem_Stdio::FS_chmod( const char *pathT, int pmode )
 	CBaseFileSystem::FixUpPath ( pathT, path, sizeof( path ) );
 
 	int rt = _chmod( path, pmode );
-#if defined(LINUX)
+#if defined(LINUX) || defined(BSD)
 	if (rt==-1)
 	{
 		char caseFixedName[ MAX_PATH ];
@@ -707,7 +707,7 @@ int CFileSystem_Stdio::FS_stat( const char *pathT, struct _stat *buf, bool *pbLo
 	}
 #endif // defined(_WIN32) && defined(FILESYSTEM_MSVC2015_STAT_BUG_WORKAROUND)
 
-#if defined(LINUX)
+#if defined(LINUX) || defined(BSD)
 	if ( rt == -1 )
 	{
 		char caseFixedName[ MAX_PATH ];
@@ -866,7 +866,7 @@ CStdioFile *CStdioFile::FS_fopen( const char *filenameT, const char *options, in
 		}
 	}
 
-#if defined(LINUX)
+#if defined(LINUX) || defined(BSD)
 	if(!pFile && !strchr(options,'w') && !strchr(options,'+') ) // try opening the lower cased version
 	{
 		char caseFixedName[ MAX_PATH ];
diff --git a/gameui/BasePanel.cpp b/gameui/BasePanel.cpp
index 3a00f666..a79e9d70 100644
--- a/gameui/BasePanel.cpp
+++ b/gameui/BasePanel.cpp
@@ -1130,7 +1130,7 @@ void CBasePanel::UpdateBackgroundState()
 			vgui::GetAnimationController()->RunAnimationCommand( m_pGameLogo, "alpha", targetTitleAlpha, 0.0f, duration, AnimationController::INTERPOLATOR_LINEAR );
 		}
 
-		// Msg( "animating title (%d => %d at time %.2f)\n", m_pGameMenuButton->GetAlpha(), (int)targetTitleAlpha, engine->Time());
+		// Msg( "animating title (%d => %d at time %.2f)\n", m_pGameMenuButtons[0]->GetAlpha(), (int)targetTitleAlpha, engine->Time());
 		for ( i=0; i<m_pGameMenuButtons.Count(); ++i )
 		{
 			vgui::GetAnimationController()->RunAnimationCommand( m_pGameMenuButtons[i], "alpha", targetTitleAlpha, 0.0f, duration, AnimationController::INTERPOLATOR_LINEAR );
@@ -1650,7 +1650,7 @@ void CBasePanel::PerformLayout()
 	for ( int i=0; i<m_pGameMenuButtons.Count(); ++i )
 	{
 		// Get the size of the logo text
-		//int textWide, textTall;
+		// int textWide, textTall;
 		m_pGameMenuButtons[i]->SizeToContents();
 		//vgui::surface()->GetTextSize( m_pGameMenuButtons[i]->GetFont(), ModInfo().GetGameTitle(), textWide, textTall );
 
@@ -2220,7 +2220,7 @@ void CBasePanel::RunMenuCommand(const char *command)
 
 				RegCloseKey(hKey);
 			}
-#elif defined( OSX ) || defined( LINUX )
+#elif defined( OSX ) || defined( LINUX ) || defined(BSD)
 			FILE *fp = fopen( "/tmp/hl2_relaunch", "w+" );
 			if ( fp )
 			{
diff --git a/gameui/VGuiSystemModuleLoader.cpp b/gameui/VGuiSystemModuleLoader.cpp
index 80781005..003cdbd7 100644
--- a/gameui/VGuiSystemModuleLoader.cpp
+++ b/gameui/VGuiSystemModuleLoader.cpp
@@ -161,7 +161,7 @@ bool CVGuiSystemModuleLoader::LoadPlatformModules(CreateInterfaceFn *factorylist
 		{
 			dllPath = it->GetString("dll_osx");
 		}
-		else if ( IsLinux() )
+		else if ( IsLinux() || IsBSD() )
 		{
 			dllPath = it->GetString("dll_linux");
 		}
diff --git a/ivp b/ivp
index 42823131..2306a253 160000
--- a/ivp
+++ b/ivp
@@ -1 +1 @@
-Subproject commit 428231315f701259387d0720170b05c23263ff4c
+Subproject commit 2306a2531691b46f739cb0b587c1f3527c7b1c11
diff --git a/launcher/launcher.cpp b/launcher/launcher.cpp
index 1a5285a9..a5314c5b 100644
--- a/launcher/launcher.cpp
+++ b/launcher/launcher.cpp
@@ -10,7 +10,7 @@
 #include <windows.h>
 #include "shlwapi.h" // registry stuff
 #include <direct.h>
-#elif defined ( LINUX ) || defined( OSX )
+#elif defined(POSIX)
 	#define O_EXLOCK 0
 	#include <sys/types.h>
 	#include <sys/stat.h>
@@ -205,7 +205,7 @@ class CVCRHelpers : public IVCRHelpers
 public:
 	virtual void ErrorMessage( const char *pMsg )
 	{
-#if defined( WIN32 ) || defined( LINUX )
+#if defined( WIN32 ) || defined( LINUX ) || defined(BSD)
 		NOVCR( ::MessageBox( NULL, pMsg, "VCR Error", MB_OK ) );
 #endif
 	}
@@ -950,7 +950,7 @@ bool GrabSourceMutex()
 
 #ifdef ANDROID
 	return true;
-#elif defined (LINUX)
+#elif defined (LINUX) || defined(BSD)
 	/*
 	 * Linux
  	 */
@@ -1198,7 +1198,7 @@ DLL_EXPORT int LauncherMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR
 DLL_EXPORT int LauncherMain( int argc, char **argv )
 #endif
 {
-#if defined LINUX && !defined ANDROID
+#if (defined(LINUX) || defined(BSD)) && !defined ANDROID
 	// Temporary fix to stop us from crashing in printf/sscanf functions that don't expect
 	//  localization to mess with your "." and "," float seperators. Mac OSX also sets LANG
 	//  to en_US.UTF-8 before starting up (in info.plist I believe).
@@ -1225,7 +1225,7 @@ DLL_EXPORT int LauncherMain( int argc, char **argv )
 	Msg("SDL version: %d.%d.%d rev: %s\n", (int)ver.major, (int)ver.minor, (int)ver.patch, SDL_GetRevision());
 #endif
 
-#if defined LINUX && defined USE_SDL && defined TOGLES && !defined ANDROID
+#if (defined LINUX || defined BSD) && defined USE_SDL && defined TOGLES && !defined ANDROID
 	SDL_SetHint(SDL_HINT_VIDEO_X11_FORCE_EGL, "1");
 #endif
 
@@ -1247,12 +1247,6 @@ DLL_EXPORT int LauncherMain( int argc, char **argv )
 	// Hook the debug output stuff.
 	SpewOutputFunc( LauncherDefaultSpewFunc );
 
-	if ( 0 && IsWin98OrOlder() )
-	{
-		Error( "This build does not currently run under Windows 98/Me." );
-		return -1;
-	}
-
 	// Quickly check the hardware key, essentially a warning shot.  
 	if ( !Plat_VerifyHardwareKeyPrompt() )
 	{
@@ -1559,7 +1553,7 @@ DLL_EXPORT int LauncherMain( int argc, char **argv )
 		RegCloseKey(hKey);
 	}
 
-#elif defined( OSX ) || defined( LINUX )
+#elif defined( OSX ) || defined( LINUX ) || defined(BSD)
 	struct stat st;
 	if ( stat( RELAUNCH_FILE, &st ) == 0 ) 
 	{
@@ -1576,7 +1570,7 @@ DLL_EXPORT int LauncherMain( int argc, char **argv )
 				}
 				szCmd[nChars] = 0;
 				char szOpenLine[ MAX_PATH ];
-				#if defined( LINUX )
+				#if defined( LINUX ) || defined(BSD)
 					Q_snprintf( szOpenLine, sizeof(szOpenLine), "xdg-open \"%s\"", szCmd );
 				#else
 					Q_snprintf( szOpenLine, sizeof(szOpenLine), "open \"%s\"", szCmd );
diff --git a/materialsystem/stdshaders/occlusion_dx9.cpp b/materialsystem/stdshaders/occlusion_dx9.cpp
index 62e7e9d9..76928713 100644
--- a/materialsystem/stdshaders/occlusion_dx9.cpp
+++ b/materialsystem/stdshaders/occlusion_dx9.cpp
@@ -59,7 +59,7 @@ BEGIN_VS_SHADER_FLAGS( Occlusion_DX9, "Help for Occlusion", SHADER_NOT_EDITABLE
 				SET_STATIC_PIXEL_SHADER( white_ps20 );
 
 				// Workaround for weird AMD bug - if sRGB write isn't enabled here then sRGB write enable in subsequent world rendering passes will randomly not take effect (even though we're enabling it) in the driver.
-				if ( ( IsLinux() || IsWindows() ) && gl_amd_occlusion_workaround.GetBool() )
+				if ( ( IsLinux() || IsWindows() || IsBSD() ) && gl_amd_occlusion_workaround.GetBool() )
 				{
 					pShaderShadow->EnableSRGBWrite( true );
 				}
diff --git a/mathlib/3dnow.cpp b/mathlib/3dnow.cpp
index a37d9bdd..88e4ead7 100644
--- a/mathlib/3dnow.cpp
+++ b/mathlib/3dnow.cpp
@@ -16,7 +16,7 @@
 // memdbgon must be the last include file in a .cpp file!!!
 #include "tier0/memdbgon.h"
 
-#if !defined(COMPILER_MSVC64) && !defined(LINUX) && !defined(OSX)
+#if !defined(COMPILER_MSVC64) && !defined(LINUX) && !defined(COMPILER_CLANG)
 // Implement for 64-bit Windows if needed.
 // Clang hits "fatal error: error in backend:" and other errors when trying
 // to compile the inline assembly below. 3DNow support is highly unlikely to
@@ -102,7 +102,7 @@ float FASTCALL _3DNow_VectorNormalize (Vector& vec)
 			movd		radius, mm1
 			femms
 		}
-#elif LINUX	
+#elif LINUX
 		long long a,c;
     		int b,d;
     		memcpy(&a,&vec[0],sizeof(a));
diff --git a/mathlib/mathlib_base.cpp b/mathlib/mathlib_base.cpp
index 64069a7b..d8901a05 100644
--- a/mathlib/mathlib_base.cpp
+++ b/mathlib/mathlib_base.cpp
@@ -3343,7 +3343,7 @@ void MathLib_Init( float gamma, float texGamma, float brightness, int overbright
 
 	// SSE Generally performs better than 3DNow when present, so this is placed 
 	// first to allow SSE to override these settings.
-#if !defined( OSX ) && !defined( PLATFORM_WINDOWS_PC64 ) && !defined(LINUX)
+#if !defined( OSX ) && !defined( PLATFORM_WINDOWS_PC64 ) && !defined(LINUX) && !defined(BSD)
 	if ( bAllow3DNow && pi.m_b3DNow )
 	{
 		s_b3DNowEnabled = true;
diff --git a/public/appframework/AppFramework.h b/public/appframework/AppFramework.h
index 185d2f33..849ac8e6 100644
--- a/public/appframework/AppFramework.h
+++ b/public/appframework/AppFramework.h
@@ -61,7 +61,7 @@ void AppShutdown( CAppSystemGroup *pAppSystemGroup );
 		extern int ValveCocoaMain( int argc, char **argv, CAppSystemGroup *pAppSystemGroup ); \
 		return ValveCocoaMain( argc, argv, &_globalVarName ); \
 	}
-#elif defined( LINUX )
+#elif defined( LINUX ) || defined(BSD)
 #define DEFINE_WINDOWED_APPLICATION_OBJECT_GLOBALVAR( _globalVarName ) \
 	int main( int argc, char **argv )										\
 	{																							\
diff --git a/public/appframework/ilaunchermgr.h b/public/appframework/ilaunchermgr.h
index bafa67cb..e65ece3d 100644
--- a/public/appframework/ilaunchermgr.h
+++ b/public/appframework/ilaunchermgr.h
@@ -52,7 +52,7 @@ public:
 		
 	// Get the next N events. The function returns the number of events that were filled into your array.
 	virtual int GetEvents( CCocoaEvent *pEvents, int nMaxEventsToReturn, bool debugEvents = false ) = 0;
-#ifdef LINUX
+#if defined(LINUX) || defined(BSD)
 	virtual int PeekAndRemoveKeyboardEvents( bool *pbEsc, bool *pbReturn, bool *pbSpace, bool debugEvents = false ) = 0;
 #endif
 
diff --git a/public/tier0/basetypes.h b/public/tier0/basetypes.h
index e883e1ca..0e67c9fa 100644
--- a/public/tier0/basetypes.h
+++ b/public/tier0/basetypes.h
@@ -39,11 +39,13 @@
 #endif
 
 // stdio.h
-#ifndef NULL
+#if !defined(NULL) || defined(__FreeBSD__)
+#ifdef NULL
+# undef NULL
+#endif
 #define NULL 0
 #endif
 
-
 #ifdef POSIX
 #include <stdint.h>
 #endif
diff --git a/public/tier0/platform.h b/public/tier0/platform.h
index 2ae632b8..03197725 100644
--- a/public/tier0/platform.h
+++ b/public/tier0/platform.h
@@ -64,7 +64,11 @@
 
 #ifdef POSIX
 // need this for _alloca
-#include <alloca.h>
+# ifdef BSD
+#  define va_list __va_list
+# else
+#  include <alloca.h>
+# endif
 #include <unistd.h>
 #include <signal.h>
 #include <time.h>
@@ -104,6 +108,7 @@
 	#define IsLinux() false
 	#define IsOSX() false
 	#define IsPosix() false
+	#define IsBSD() false
 	#define PLATFORM_WINDOWS 1 // Windows PC or Xbox 360
 	#ifndef _X360
 		#define IsWindows() true
@@ -156,7 +161,13 @@
 	#else
 		#define IsOSX() false
 	#endif
-	
+
+	#ifdef BSD
+		#define IsBSD() true
+	#else
+		#define IsBSD() false
+	#endif
+
 	#define IsPosix() true
 	#define IsPlatformOpenGL() true
 #else
@@ -439,20 +450,20 @@ typedef void * HINSTANCE;
 #else
 	// On OSX, SIGTRAP doesn't really stop the thread cold when debugging.
 	// So if being debugged, use INT3 which is precise.
-#ifdef OSX
-#if defined(__arm__) || defined(__aarch64__)
-#ifdef __clang__
-#define DebuggerBreak()  do { if ( Plat_IsInDebugSession() ) { __builtin_debugtrap(); } else { raise(SIGTRAP); } } while(0)
-#elif defined __GNUC__
-#define DebuggerBreak()  do { if ( Plat_IsInDebugSession() ) { __builtin_trap(); } else { raise(SIGTRAP); } } while(0)
-#else
-#define DebuggerBreak()  raise(SIGTRAP)
-#endif
-#else
-#define DebuggerBreak()  do { if ( Plat_IsInDebugSession() ) { __asm ( "int $3" ); } else { raise(SIGTRAP); } } while(0)
-#endif
+#if defined(OSX) || defined(BSD)
+# if defined(__arm__) || defined(__aarch64__)
+#  ifdef __clang__
+#   define DebuggerBreak()  do { if ( Plat_IsInDebugSession() ) { __builtin_debugtrap(); } else { raise(SIGTRAP); } } while(0)
+#  elif defined __GNUC__
+#   define DebuggerBreak()  do { if ( Plat_IsInDebugSession() ) { __builtin_trap(); } else { raise(SIGTRAP); } } while(0)
+#  else
+#   define DebuggerBreak()  raise(SIGTRAP)
+#  endif
+# else
+#  define DebuggerBreak()  do { if ( Plat_IsInDebugSession() ) { __asm ( "int $3" ); } else { raise(SIGTRAP); } } while(0)
+# endif
 #else
-#define DebuggerBreak()  raise(SIGTRAP)
+# define DebuggerBreak()  raise(SIGTRAP)
 #endif
 #endif
 #define	DebuggerBreakIfDebugging() if ( !Plat_IsInDebugSession() ) ; else DebuggerBreak()
@@ -550,7 +561,7 @@ typedef void * HINSTANCE;
 //-----------------------------------------------------------------------------
 #if defined( GNUC )
 	#define stackalloc( _size )		alloca( ALIGN_VALUE( _size, 16 ) )
-#ifdef _LINUX
+#if defined(_LINUX) || defined(BSD)
 	#define mallocsize( _p )	( malloc_usable_size( _p ) )
 #elif defined(OSX)
 	#define mallocsize( _p )	( malloc_size( _p ) )
@@ -1377,10 +1388,11 @@ PLATFORM_INTERFACE void* Plat_SimpleLog( const tchar* file, int line );
 //-----------------------------------------------------------------------------
 // Returns true if debugger attached, false otherwise
 //-----------------------------------------------------------------------------
-#if defined(_WIN32) || defined(LINUX) || defined(OSX)
+#if defined(_WIN32) || defined(LINUX) || defined(OSX) || defined(BSD)
 PLATFORM_INTERFACE bool Plat_IsInDebugSession();
 PLATFORM_INTERFACE void Plat_DebugString( const char * );
 #else
+#warning "Plat_IsInDebugSession isn't working properly"
 inline bool Plat_IsInDebugSession( bool bForceRecheck = false ) { return false; }
 #define Plat_DebugString(s) ((void)0)
 #endif
diff --git a/public/tier0/threadtools.h b/public/tier0/threadtools.h
index a73554be..6dff8b43 100644
--- a/public/tier0/threadtools.h
+++ b/public/tier0/threadtools.h
@@ -285,7 +285,7 @@ PLATFORM_INTERFACE void ThreadSetAffinity( ThreadHandle_t hThread, int nAffinity
 #error Every platform needs to define ThreadMemoryBarrier to at least prevent compiler reordering
 #endif
 
-#if defined( _LINUX ) || defined( _OSX )
+#if defined( _LINUX ) || defined( _OSX ) || defined(BSD)
 #define USE_INTRINSIC_INTERLOCKED
 // linux implementation
 inline int32 ThreadInterlockedIncrement( int32 volatile *p )
@@ -486,7 +486,7 @@ PLATFORM_INTERFACE void ThreadNotifySyncReleasing(void *p);
 
 #ifndef NO_THREAD_LOCAL
 
-#if defined(WIN32) || defined(OSX) ||  defined( _PS3 ) || ( defined (_LINUX) )
+#if defined(WIN32) || defined(OSX) ||  defined( _PS3 ) || ( defined (_LINUX) ) || defined(BSD)
 #ifndef __AFXTLS_H__ // not compatible with some Windows headers
 
 #if defined(_PS3)
diff --git a/public/tier1/interface.h b/public/tier1/interface.h
index 5453f67d..09b24caf 100644
--- a/public/tier1/interface.h
+++ b/public/tier1/interface.h
@@ -36,7 +36,7 @@
 #pragma once
 #endif
 
-#ifdef _LINUX
+#if defined(_LINUX) || defined(BSD)
 #include <dlfcn.h> // dlopen,dlclose, et al
 #include <unistd.h>
 
diff --git a/scripts/waifulib/compiler_optimizations.py b/scripts/waifulib/compiler_optimizations.py
index c2a6841d..73de2120 100644
--- a/scripts/waifulib/compiler_optimizations.py
+++ b/scripts/waifulib/compiler_optimizations.py
@@ -50,7 +50,7 @@ CFLAGS = {
 		# disable thread-safe local static initialization for C++11 code, as it cause crashes on Windows XP
 		'msvc':    ['/D_USING_V110_SDK71_', '/Zi', '/FS', '/Zc:threadSafeInit-'],
 		'clang':   ['-fno-strict-aliasing', '-fvisibility=hidden'],
-		'gcc':     ['-g0', '-fno-strict-aliasing', '-fvisibility=hidden'],
+		'gcc':     ['-fno-strict-aliasing', '-fvisibility=hidden'],
 		'owcc':	   ['-fno-short-enum', '-ffloat-store', '-g0']
 	},
 	'fast': {
@@ -73,7 +73,7 @@ CFLAGS = {
 	'debug': {
 		'msvc':    ['/Od', '/MTd'],
 		'owcc':    ['-g', '-O0', '-fno-omit-frame-pointer', '-funwind-tables', '-fno-omit-leaf-frame-pointer'],
-		'default': ['-g', '-O0'] #, '-ftree-vectorize', '-ffast-math', '-fno-tree-partial-pre']
+		'default': ['-g', '-O0'] #, '-ftree-vectorize', '-ffast-math']
 	},
 	'sanitize': {
 		'msvc':    ['/Od', '/RTC1', '/MT'],
diff --git a/serverbrowser/ServerBrowserDialog.cpp b/serverbrowser/ServerBrowserDialog.cpp
index 3faf2d14..b13f9cd8 100644
--- a/serverbrowser/ServerBrowserDialog.cpp
+++ b/serverbrowser/ServerBrowserDialog.cpp
@@ -25,7 +25,7 @@
 #define WIN32_LEAN_AND_MEAN
 #include <winsock.h>
 #endif
-#ifdef LINUX
+#if defined(LINUX) || defined(BSD)
 #include <arpa/inet.h>
 #endif
 
diff --git a/tier0/cpu.cpp b/tier0/cpu.cpp
index f5c29fda..f997ffb0 100644
--- a/tier0/cpu.cpp
+++ b/tier0/cpu.cpp
@@ -11,7 +11,7 @@
 #include <windows.h>
 #elif defined(_LINUX)
 #include <stdlib.h>
-#elif defined(OSX)
+#elif defined(OSX) || defined(BSD)
 #include <sys/sysctl.h>
 #endif
 
@@ -273,7 +273,7 @@ bool CheckSSE4aTechnology( void )
 
 static bool Check3DNowTechnology(void)
 {
-#if defined( _X360 ) || defined( _PS3 ) || defined (__arm__) || defined(__SANITIZE_ADDRESS__)
+#if defined( _X360 ) || defined( _PS3 ) || defined (__arm__) || defined(__SANITIZE_ADDRESS__) || (defined(BSD) && defined(COMPILER_CLANG))
 	return false;
 #else
 	uint32 eax, unused;
@@ -448,7 +448,9 @@ uint64 CalculateCPUFreq(); // from cpu_linux.cpp
 static int64 CalculateClockSpeed()
 {
 #if defined( _WIN32 )
-#if !defined( _X360 )
+#if defined( _X360 )
+	return 3200000000LL;
+#else
 	LARGE_INTEGER waitTime, startCount, curCount;
 	CCycleCount start, end;
 
@@ -476,15 +478,14 @@ static int64 CalculateClockSpeed()
 		freq = 2000000000;
 	}
 	return freq;
-
-#else
-	return 3200000000LL;
 #endif
+#elif defined(BSD)
+	return CalculateCPUFreq() * 1000000.0f;
 #elif defined(POSIX)
 	int64 freq =(int64)CalculateCPUFreq();
 	if ( freq == 0 ) // couldn't calculate clock speed
 	{
-		Error( "Unable to determine CPU Frequency\n" );
+		Warning( "Unable to determine CPU Frequency\n" );
 	}
 	return freq;
 #endif
@@ -583,7 +584,7 @@ const CPUInformation* GetCPUInformation()
 		pi.m_nLogicalProcessors  = 1;
 		Assert( !"couldn't read cpu information from /proc/cpuinfo" );
 	}
-#elif defined(OSX)
+#elif defined(OSX) || defined(BSD)
 	int mib[2], num_cpu = 1;
 	size_t len;
 	mib[0] = CTL_HW;
diff --git a/tier0/cpu_posix.cpp b/tier0/cpu_posix.cpp
index 14fde7ee..f47444fb 100644
--- a/tier0/cpu_posix.cpp
+++ b/tier0/cpu_posix.cpp
@@ -11,6 +11,11 @@
 #include <linux/sysctl.h>
 #else
 #include <sys/sysctl.h>
+# ifdef __APPLE__
+#  define CPUFREQ_SYSCTL "hw.cpufrequency_max"
+# else
+#  define CPUFREQ_SYSCTL "dev.cpu.0.freq"
+# endif
 #endif
 #include <sys/time.h>
 #include <unistd.h>
@@ -46,18 +51,15 @@ static inline uint64 diff(uint64 v1, uint64 v2)
 		return -d;
 }
 
-#ifdef OSX
+#if defined(OSX) || defined(BSD)
 
-// Mac
+// Mac or BSD
 uint64 GetCPUFreqFromPROC()
 {
-	int mib[2] = {CTL_HW, HW_CPU_FREQ};
-	uint64 frequency = 0;
-	size_t len = sizeof(frequency);
-
-	if (sysctl(mib, 2, &frequency, &len, NULL, 0) == -1)
-		return 0;
-	return frequency;
+	uint64 freq_hz = 0;
+	size_t freq_size = sizeof(freq_hz);
+	int retval = sysctlbyname(CPUFREQ_SYSCTL, &freq_hz, &freq_size, NULL, 0);
+	return freq_hz;
 }
 
 #else
@@ -99,14 +101,8 @@ uint64 GetCPUFreqFromPROC()
 
 uint64 CalculateCPUFreq()
 {
-#ifdef __APPLE__
-	uint64 freq_hz = 0;
-	size_t freq_size = sizeof(freq_hz);
-	int retval = sysctlbyname("hw.cpufrequency_max", &freq_hz, &freq_size, NULL, 0);
-	// MoeMod : TODO dont know how to get freq on Apple Silicon
-	if(!freq_hz)
-		freq_hz = 3200000000;
-	return freq_hz;
+#if defined(__APPLE__) || defined(BSD)
+	return GetCPUFreqFromPROC();
 #else
 	// Try to open cpuinfo_max_freq. If the kernel was built with cpu scaling support disabled, this will fail.
 	FILE *fp = fopen( "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq", "r" );
@@ -127,9 +123,9 @@ uint64 CalculateCPUFreq()
 			return retVal * 1000;
 		}
 	}
-#endif
 
 #if !defined(__arm__) && !defined(__aarch64__)
+	// fallback mechanism to calculate when failed
 	// Compute the period. Loop until we get 3 consecutive periods that
 	// are the same to within a small error. The error is chosen
 	// to be +/- 0.02% on a P-200.
@@ -179,7 +175,10 @@ uint64 CalculateCPUFreq()
 	}
 
 	return period;
-#endif
+#else
+	// ARM hard-coded frequency
 	return (uint64)2000000000;
+#endif // if !ARM
+#endif // if APPLE
 }
 
diff --git a/tier0/platform_posix.cpp b/tier0/platform_posix.cpp
index dbfaf36e..ee930b90 100644
--- a/tier0/platform_posix.cpp
+++ b/tier0/platform_posix.cpp
@@ -16,12 +16,17 @@
 #include <sys/resource.h>
 #include <unistd.h>
 
-#ifdef OSX
-#include <mach/mach.h>
-#include <mach/mach_time.h>
+#if defined(OSX) || defined(BSD)
+# ifdef BSD
+#  include <sys/proc.h>
+#  include <sys/user.h>
+# else
+#  include <mach/mach.h>
+#  include <mach/mach_time.h>
+# endif
 #include <stdbool.h>
-#include <sys/types.h>
 #include <unistd.h>
+#include <sys/types.h>
 #include <sys/sysctl.h>
 #endif
 #ifdef LINUX
@@ -436,41 +441,29 @@ PLATFORM_INTERFACE void Plat_SetAllocErrorFn( Plat_AllocErrorFn fn )
 
 #endif // !NO_HOOK_MALLOC
 
-#if defined( OSX )
+#if defined( OSX ) || defined(BSD)
 
 // From the Apple tech note: http://developer.apple.com/library/mac/#qa/qa1361/_index.html
 bool Plat_IsInDebugSession()
 {
+	static int s_IsInDebugSession;
 	int                 junk;
-	int                 mib[4];
 	struct kinfo_proc   info;
 	size_t              size;
-	static int s_IsInDebugSession = -1;
-
-	if ( s_IsInDebugSession == -1 )
-	{
-		// Initialize the flags so that, if sysctl fails for some bizarre 
-		// reason, we get a predictable result.
-
-		info.kp_proc.p_flag = 0;
-
-		// Initialize mib, which tells sysctl the info we want, in this case
-		// we're looking for information about a specific process ID.
-
-		mib[0] = CTL_KERN;
-		mib[1] = KERN_PROC;
-		mib[2] = KERN_PROC_PID;
-		mib[3] = getpid();
-
-		// Call sysctl.
-
-		size = sizeof(info);
-		junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0);
+	int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid()};
+#ifndef BSD
+	info.kp_proc.p_flag = 0;
+#endif
 
-		// We're being debugged if the P_TRACED flag is set.
+	size = sizeof(info);
+	junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0);
 
-		s_IsInDebugSession = ( (info.kp_proc.p_flag & P_TRACED) != 0 );
-	}
+	// We're being debugged if the P_TRACED flag is set.
+#ifdef BSD
+	s_IsInDebugSession = info.ki_flag & P_TRACED;
+#else
+	s_IsInDebugSession = info.kp_proc.p_flag & P_TRACED;
+#endif
 
 	return !!s_IsInDebugSession;
 }
@@ -509,7 +502,6 @@ bool Plat_IsInDebugSession()
 	return ( tracerpid > 0 );
 }
 
-
 #endif // defined( LINUX )
 
 void Plat_DebugString( const char * psz )
@@ -567,7 +559,7 @@ PLATFORM_INTERFACE const char *Plat_GetCommandLineA()
 
 PLATFORM_INTERFACE bool GetMemoryInformation( MemoryInformation *pOutMemoryInfo )
 {
-	#if defined( LINUX ) || defined( OSX )
+	#if defined( LINUX ) || defined( OSX ) || defined(BSD)
 		return false;
 	#else
 		#error "Need to fill out GetMemoryInformation or at least return false for this platform"
@@ -579,7 +571,7 @@ PLATFORM_INTERFACE bool Is64BitOS()
 {
 #if defined OSX
 	return true;
-#elif defined LINUX
+#elif defined(LINUX) || defined(BSD)
 	FILE *pp = popen( "uname -m", "r" );
 	if ( pp != NULL )
 	{
@@ -789,7 +781,7 @@ static void InstallHooks( void )
 	__realloc_hook = ReallocHook;
 
 }
-#elif OSX
+#elif OSX || BSD
 
 
 static void RemoveHooks( void )
diff --git a/tier0/threadtools.cpp b/tier0/threadtools.cpp
index 46e18298..5ae40007 100644
--- a/tier0/threadtools.cpp
+++ b/tier0/threadtools.cpp
@@ -43,6 +43,11 @@
 	#define OS_TO_PTHREAD(x) pthread_from_mach_thread_np( x )
 #endif // !OSX
 
+#ifdef BSD
+# undef OS_TO_PTRHEAD
+# define OS_TO_PTHREAD(x) (pthread_t)(x)
+#endif
+
 #endif
 
 #ifndef _PS3
@@ -1680,7 +1685,7 @@ bool CThreadFullMutex::Release()
 //
 //-----------------------------------------------------------------------------
 
-#if defined( WIN32 ) || defined( _PS3 ) || defined( _OSX ) || defined (_LINUX)
+#if defined( WIN32 ) || defined( _PS3 ) || defined( _OSX ) || defined (_LINUX) || defined(BSD)
 #if !defined(_PS3)
 namespace GenericThreadLocals
 {
diff --git a/tier1/KeyValues.cpp b/tier1/KeyValues.cpp
index 9218874d..8e855a78 100644
--- a/tier1/KeyValues.cpp
+++ b/tier1/KeyValues.cpp
@@ -2211,7 +2211,7 @@ bool EvaluateConditional( const char *str )
 		return bNot;
 
 	if ( Q_stristr( str, "$LINUX" ) )
-		return (IsLinux() || IsOSX()) ^ bNot;
+		return ( IsLinux() || IsBSD() || IsOSX() ) ^ bNot;
 
 	if ( Q_stristr( str, "$POSIX" ) )
 		return IsPosix() ^ bNot;
diff --git a/tier1/strtools.cpp b/tier1/strtools.cpp
index 7489654c..e4d40fd3 100644
--- a/tier1/strtools.cpp
+++ b/tier1/strtools.cpp
@@ -2953,7 +2953,7 @@ extern "C" void qsort_s( void *base, size_t num, size_t width, int (*compare )(v
 
 void V_qsort_s( void *base, size_t num, size_t width, int ( __cdecl *compare )(void *, const void *, const void *), void * context ) 
 {
-#if defined OSX
+#if defined(OSX) || defined(BSD)
 	// the arguments are swapped 'round on the mac - awesome, huh?
 	return qsort_r( base, num, width, context, compare );
 #else
diff --git a/togl/linuxwin/dxabstract.cpp b/togl/linuxwin/dxabstract.cpp
index e637cf1e..b0f890db 100644
--- a/togl/linuxwin/dxabstract.cpp
+++ b/togl/linuxwin/dxabstract.cpp
@@ -38,7 +38,7 @@
 
 #include "glmgr_flush.inl"
 
-#if defined(OSX) || defined(LINUX) || (defined (WIN32) && defined( DX_TO_GL_ABSTRACTION ))
+#if defined(OSX) || defined(LINUX) || (defined (WIN32) && defined( DX_TO_GL_ABSTRACTION )) || defined(BSD)
 	#include "appframework/ilaunchermgr.h"
 	extern ILauncherMgr *g_pLauncherMgr;
 #endif
diff --git a/togl/linuxwin/glentrypoints.cpp b/togl/linuxwin/glentrypoints.cpp
index ef1f01ff..a2118f43 100644
--- a/togl/linuxwin/glentrypoints.cpp
+++ b/togl/linuxwin/glentrypoints.cpp
@@ -43,7 +43,7 @@
 #include "tier1.h"
 #include "tier2/tier2.h"
 
-#if defined(_LINUX) && !defined(__ANDROID__)
+#if (defined(_LINUX) || defined(BSD)) && !defined(__ANDROID__)
 #include <GL/glx.h>
 #endif
 
@@ -54,7 +54,7 @@
 #error
 #endif
 
-#if defined(OSX) || defined(LINUX) || (defined (WIN32) && defined( DX_TO_GL_ABSTRACTION ))
+#if defined(OSX) || defined(LINUX) || (defined (WIN32) && defined( DX_TO_GL_ABSTRACTION )) || defined(BSD)
 	#include "appframework/ilaunchermgr.h"
 	ILauncherMgr *g_pLauncherMgr = NULL;
 #endif
diff --git a/togles/linuxwin/dxabstract.cpp b/togles/linuxwin/dxabstract.cpp
index 1f22da17..a993c095 100644
--- a/togles/linuxwin/dxabstract.cpp
+++ b/togles/linuxwin/dxabstract.cpp
@@ -38,7 +38,7 @@
 
 #include "glmgr_flush.inl"
 
-#if defined(OSX) || defined(LINUX) || (defined (WIN32) && defined( DX_TO_GL_ABSTRACTION ))
+#if defined(BSD) || defined(OSX) || defined(LINUX) || (defined (WIN32) && defined( DX_TO_GL_ABSTRACTION ))
 	#include "appframework/ilaunchermgr.h"
 	extern ILauncherMgr *g_pLauncherMgr;
 #endif
diff --git a/togles/linuxwin/glentrypoints.cpp b/togles/linuxwin/glentrypoints.cpp
index ccf920a6..6834696b 100644
--- a/togles/linuxwin/glentrypoints.cpp
+++ b/togles/linuxwin/glentrypoints.cpp
@@ -54,7 +54,7 @@
 #error
 #endif
 
-#if defined(OSX) || defined(LINUX) || (defined (WIN32) && defined( DX_TO_GL_ABSTRACTION ))
+#if defined(BSD) || defined(OSX) || defined(LINUX) || (defined (WIN32) && defined( DX_TO_GL_ABSTRACTION ))
 	#include "appframework/ilaunchermgr.h"
 	ILauncherMgr *g_pLauncherMgr = NULL;
 #endif
diff --git a/vgui2/src/system_posix.cpp b/vgui2/src/system_posix.cpp
index 349165b2..f781805f 100644
--- a/vgui2/src/system_posix.cpp
+++ b/vgui2/src/system_posix.cpp
@@ -28,13 +28,15 @@
 #include "vgui_key_translation.h"
 #include "filesystem.h"
 
-#ifdef OSX
-#include <Carbon/Carbon.h>
+#if defined(OSX) || defined(BSD)
 #include <sys/param.h>
 #include <sys/mount.h>
 #elif defined(LINUX)
 #include <sys/vfs.h>
 #endif
+#ifdef OSX
+#include <Carbon/Carbon.h>
+#endif
 
 #ifdef USE_SDL
 #include "SDL_clipboard.h"
@@ -290,7 +292,7 @@ void CSystem::ShellExecute(const char *command, const char *file)
 	if ( pid == 0 )
 	{
 		// Child
-#ifdef LINUX
+#if defined(LINUX) || defined(BSD)
 		// Escape steam runtime if necessary
 		const char *szSteamRuntime = getenv( "STEAM_RUNTIME" );
 		if ( szSteamRuntime )
@@ -585,7 +587,7 @@ int CSystem::GetAvailableDrives(char *buf, int bufLen)
 //-----------------------------------------------------------------------------
 double CSystem::GetFreeDiskSpace(const char *path)
 {
-#if __DARWIN_ONLY_64_BIT_INO_T
+#if __DARWIN_ONLY_64_BIT_INO_T || BSD
     // MoeMod: newer macOS only support 64bit, so no statfs64 is provided
     struct statfs buf;
     int ret = statfs( path, &buf );
diff --git a/vgui2/vgui_surfacelib/FontManager.cpp b/vgui2/vgui_surfacelib/FontManager.cpp
index dd86900e..78671320 100644
--- a/vgui2/vgui_surfacelib/FontManager.cpp
+++ b/vgui2/vgui_surfacelib/FontManager.cpp
@@ -43,7 +43,7 @@ CFontManager::CFontManager()
 	m_FontAmalgams.AddToTail();
 	m_Win32Fonts.EnsureCapacity( MAX_INITIAL_FONTS );
 
-#if defined(LINUX) || defined(OSX)
+#ifdef POSIX
 	FT_Error error = FT_Init_FreeType( &library ); 
 	if ( error )
 		Error( "Unable to initalize freetype library, is it installed?" );
@@ -75,7 +75,7 @@ CFontManager::~CFontManager()
 {
 	ClearAllFonts();
 	m_FontAmalgams.RemoveAll();
-#if defined(LINUX) || defined(OSX)
+#ifdef POSIX
 	FT_Done_FreeType( library );
 #endif
 }
@@ -280,7 +280,7 @@ font_t *CFontManager::CreateOrFindWin32Font(const char *windowsFontName, int tal
 		i = m_Win32Fonts.AddToTail();
 		m_Win32Fonts[i] = NULL;
 
-#if defined(LINUX) || defined(OSX)
+#ifdef POSIX
 		int memSize = 0;
 		void *pchFontData = m_pFontDataHelper( windowsFontName, memSize, NULL );
 
@@ -584,7 +584,7 @@ FallbackFont_t g_FallbackFonts[] =
 	{ NULL, "Monaco" }		// every other font falls back to this
 };
 
-#elif defined(LINUX)
+#elif defined(LINUX) || defined(BSD)
 static const char *g_szValidAsianFonts[] = { "Marlett", "WenQuanYi Zen Hei", "unifont", NULL };
 
 // list of how fonts fallback
@@ -649,7 +649,7 @@ const char *CFontManager::GetForeignFallbackFontName()
 	return "Tahoma";
 #elif defined(OSX)
 	return "Helvetica";
-#elif defined(LINUX)
+#elif defined(LINUX) || defined(BSD)
 	return "WenQuanYi Zen Hei";
 #elif defined(_PS3)
 	return "Tahoma";
@@ -750,7 +750,7 @@ void CFontManager::GetKernedCharWidth( vgui::HFont font, wchar_t ch, wchar_t chB
 	if ( m_FontAmalgams[font].GetFontForChar( chAfter ) != pFont )
 		chAfter = 0;
 
-#if defined(LINUX) || defined(OSX)
+#ifdef POSIX
 	pFont->GetKernedCharWidth( ch, chBefore, chAfter, wide, flabcA, flabcC );
 #else
 	pFont->GetKernedCharWidth( ch, chBefore, chAfter, wide, flabcA );
diff --git a/vgui2/vgui_surfacelib/wscript b/vgui2/vgui_surfacelib/wscript
index d93032bf..c469a336 100644
--- a/vgui2/vgui_surfacelib/wscript
+++ b/vgui2/vgui_surfacelib/wscript
@@ -39,7 +39,7 @@ def build(bld):
 		'../../public/tier0',
 		'../../public/tier1',
 		'../../common',
-	] + bld.env.INCLUDES_FT2
+	] + bld.env.INCLUDES_FC + bld.env.INCLUDES_FT2
 
 	defines = []
 
diff --git a/vguimatsurface/FontTextureCache.cpp b/vguimatsurface/FontTextureCache.cpp
index d94e9afa..bed3726e 100644
--- a/vguimatsurface/FontTextureCache.cpp
+++ b/vguimatsurface/FontTextureCache.cpp
@@ -10,7 +10,7 @@
 #include <windows.h>
 #elif defined( OSX )
 #include <Carbon/Carbon.h>
-#elif defined( LINUX )
+#elif defined( LINUX ) || defined(BSD)
 //#error
 #elif defined( _X360 )
 #else
diff --git a/vguimatsurface/MatSystemSurface.cpp b/vguimatsurface/MatSystemSurface.cpp
index 1f8d53e9..feb15010 100644
--- a/vguimatsurface/MatSystemSurface.cpp
+++ b/vguimatsurface/MatSystemSurface.cpp
@@ -146,7 +146,7 @@ CMatSystemSurface g_MatSystemSurface;
 EXPOSE_SINGLE_INTERFACE_GLOBALVAR( CMatSystemSurface, ISurface, 
 						VGUI_SURFACE_INTERFACE_VERSION, g_MatSystemSurface );
 
-#if defined(LINUX) || defined(OSX)
+#if defined(LINUX) || defined(OSX) || defined(BSD)
 CUtlDict< CMatSystemSurface::font_entry, unsigned short > CMatSystemSurface::m_FontData;
 #endif
 
@@ -407,7 +407,7 @@ InitReturnVal_t CMatSystemSurface::Init( void )
 		FontManager().SetLanguage( "english" );
 	}
 
-#if defined(LINUX) || defined(OSX)
+#if defined(LINUX) || defined(OSX) || defined(BSD)
 	FontManager().SetFontDataHelper( &CMatSystemSurface::FontDataHelper );
 #endif
 
@@ -1907,7 +1907,7 @@ bool CMatSystemSurface::AddCustomFontFile( const char *fontName, const char *fon
 	}
 	Assert( success );
 	return success;
-#elif defined(LINUX) || defined(OSX)
+#elif defined(LINUX) || defined(OSX) || defined(BSD)
 
 	int size;
 	if ( CMatSystemSurface::FontDataHelper( fontName, size, fontFileName ) )
@@ -1921,7 +1921,7 @@ bool CMatSystemSurface::AddCustomFontFile( const char *fontName, const char *fon
 #endif
 }
 
-#if defined(LINUX) || defined(OSX)
+#if defined(LINUX) || defined(OSX) || defined(BSD)
 
 static void RemoveSpaces( CUtlString &str )
 {
diff --git a/vguimatsurface/MatSystemSurface.h b/vguimatsurface/MatSystemSurface.h
index 33889513..cbcc09d3 100644
--- a/vguimatsurface/MatSystemSurface.h
+++ b/vguimatsurface/MatSystemSurface.h
@@ -556,7 +556,7 @@ private:
 	int m_nFullscreenViewportHeight;
 	ITexture *m_pFullscreenRenderTarget;
 
-#if defined(LINUX) || defined(OSX)
+#if defined(LINUX) || defined(OSX) || defined(BSD)
 	struct font_entry
 	{
 		void *data;
diff --git a/video/videoservices.cpp b/video/videoservices.cpp
index 24417c71..27e913d1 100644
--- a/video/videoservices.cpp
+++ b/video/videoservices.cpp
@@ -58,14 +58,14 @@ DEFINE_ENUM_BITWISE_OPERATORS( EPlatform_t );
 	const EPlatform_t	thisPlatform = PLATFORM_XBOX_360;
 #elif defined( _PS3 )
 	const EPlatform_t	thisPlatform = PLATFORM_PS3;
-#elif defined ( _LINUX ) 
+#elif defined ( _LINUX ) || defined(BSD)
 	const EPlatform_t	thisPlatform = PLATFORM_LINUX;
 #else
   #error "UNABLE TO DETERMINE PLATFORM"
 #endif
 
 
-#if defined( OSX ) || defined( LINUX )
+#if defined( OSX ) || defined( LINUX ) || defined(BSD)
 ILauncherMgr *g_pLauncherMgr = NULL;
 #endif
 
@@ -1382,7 +1382,7 @@ bool CVideoCommonServices::ProcessFullScreenInput( bool &bAbortEvent, bool &bPau
 	bool bEscPressed    = ( m_bScanEsc )    ? CGEventSourceKeyState( kCGEventSourceStateCombinedSessionState, kVK_Escape ) : false;
 	bool bReturnPressed = ( m_bScanReturn ) ? CGEventSourceKeyState( kCGEventSourceStateCombinedSessionState, kVK_Return ) : false;
 	bool bSpacePressed  = ( m_bScanSpace )  ? CGEventSourceKeyState( kCGEventSourceStateCombinedSessionState, kVK_Space )  : false;
-#elif defined(LINUX)
+#elif defined(LINUX) || defined(BSD)
 	g_pLauncherMgr->PumpWindowsMessageLoop();
 
 	// Escape, return, or space stops or pauses the playback
diff --git a/wscript b/wscript
index 1562376a..b865a1c5 100644
--- a/wscript
+++ b/wscript
@@ -221,6 +221,14 @@ def define_platform(conf):
 			'_DLL_EXT=.dylib'
 		])
 
+	elif conf.env.DEST_OS in ['freebsd', 'openbsd', 'netbsd', 'dragonflybsd']: # Tested only in freebsd
+		conf.env.append_unique('DEFINES', [
+			'POSIX=1', '_POSIX=1', 'PLATFORM_POSIX=1',
+			'GNUC', # but uses clang
+			'BSD=1',
+			'_DLL_EXT=.so'
+		])
+
 	if conf.options.DEBUG_ENGINE:
 		conf.env.append_unique('DEFINES', [
 			'DEBUG', '_DEBUG'
@@ -370,6 +378,9 @@ def configure(conf):
 	elif conf.env.DEST_CPU in ['arm', 'aarch64']:
 		flags += ['-fsigned-char']
 
+	if conf.env.DEST_OS == 'freebsd':
+		linkflags += ['-lexecinfo']
+
 	if conf.env.DEST_OS != 'win32':
 		cflags += flags
 		linkflags += flags