diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d07a57c..75e2960e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,6 +29,8 @@ endif()
 # Install custom module path
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake/")
 
+include(CheckIncludeFile)
+include(CheckCSourceCompiles)
 include(VSForceXPToolchain) # Force XP toolchain for Visual Studio
 
 project (HLSDK-XASH3D)
@@ -55,15 +57,29 @@ else()
 	option(64BIT "Disable auto -m32 appending to compiler flags" ON)
 endif()
 
+option(BARNACLE_FIX_VISIBILITY "Enable barnacle tongue length fix" OFF)
+option(CLIENT_WEAPONS "Enable client local weapons prediction" ON)
+option(CROWBAR_IDLE_ANIM "Enable crowbar idle animation" OFF)
+option(CROWBAR_DELAY_FIX "Enable crowbar attack delay fix" OFF)
+option(CROWBAR_FIX_RAPID_CROWBAR "Enable rapid crowbar fix" OFF)
+option(GAUSS_OVERCHARGE_FIX "Enable gauss overcharge fix" OFF)
+option(OEM_BUILD "Enable OEM Build" OFF)
+option(HLDEMO_BUILD "Enable Demo Build" OFF)
+
 set(GAMEDIR "HLTopDown" CACHE STRING "Gamedir path")
 set(SERVER_INSTALL_DIR "dlls" CACHE STRING "Where put server dll")
 set(CLIENT_INSTALL_DIR "cl_dlls" CACHE STRING "Where put client dll")
 set(SERVER_LIBRARY_NAME "hl" CACHE STRING "Library name for PC platforms")
+message(STATUS "Half-Life: Top-Down")
 
 #-----------------
 # MAIN BUILD CODE \
 ###################\
 
+if(HLDEMO_BUILD AND OEM_BUILD)
+	message(FATAL_ERROR "Don't mix Demo and OEM builds!")
+endif()
+
 if(CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT 64BIT)
 	if(MSVC)
 		error("UNDONE: set 32 build flags")
@@ -89,6 +105,46 @@ else()
 	message(STATUS "Building for 32 Bit")
 endif()
 
+if(CLIENT_WEAPONS)
+	message(STATUS "Client weapons enabled.")
+	add_definitions(-DCLIENT_WEAPONS)
+endif()
+
+if(BARNACLE_FIX_VISIBILITY)
+	message(STATUS "Barnacle tongue fix enabled")
+	add_definitions(-DBARNACLE_FIX_VISIBILITY)
+endif()
+
+if(CROWBAR_IDLE_ANIM)
+	message(STATUS "Crowbar idle animation enabled")
+	add_definitions(-DCROWBAR_IDLE_ANIM)
+endif()
+
+if(CROWBAR_DELAY_FIX)
+	message(STATUS "Crowbar attack delay fix enabled")
+	add_definitions(-DCROWBAR_DELAY_FIX)
+endif()
+
+if(CROWBAR_FIX_RAPID_CROWBAR)
+	message(STATUS "Rapid crowbar fix enabled")
+	add_definitions(-DCROWBAR_FIX_RAPID_CROWBAR)
+endif()
+
+if(GAUSS_OVERCHARGE_FIX)
+	message(STATUS "Gauss overcharge fix enabled")
+	add_definitions(-DGAUSS_OVERCHARGE_FIX)
+endif()
+
+if(OEM_BUILD)
+	message(STATUS "OEM build enabled")
+	add_definitions(-DOEM_BUILD)
+endif()
+
+if(HLDEMO_BUILD)
+	message(STATUS "Demo build enabled")
+	add_definitions(-DHLDEMO_BUILD)
+endif()
+
 if (MINGW)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libstdc++ -static-libgcc")
 	set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--add-stdcall-alias")
@@ -111,15 +167,29 @@ else()
 	add_definitions(-D_CRT_SILENCE_NONCONFORMING_TGMATH_H)
 endif()
 
+check_include_file("tgmath.h" HAVE_TGMATH_H)
+if(HAVE_TGMATH_H)
+	if(NOT MSVC)
+		set(CMAKE_REQUIRED_LIBRARIES "m")
+	endif()
+	check_c_source_compiles("#include <tgmath.h>
+	const float val = 2, val2 = 3;
+	int main(){ return (int)(-asin(val) + cos(val2)); }" HAVE_VALID_TGMATH_H )
+	if(${HAVE_VALID_TGMATH_H})
+		add_definitions(-DHAVE_TGMATH_H)
+	endif()
+endif()
 
 if(BUILD_CLIENT)
+	message(STATUS "Building client enabled")
 	add_subdirectory(cl_dll)
 endif()
 
 if(BUILD_SERVER)
+	message(STATUS "Building server enabled")
 	add_subdirectory(dlls)
 endif()
 
 if(NOT BUILD_SERVER AND NOT BUILD_CLIENT)
-	error("Nothing to build")
+	message(FATAL_ERROR "Nothing to build")
 endif()
diff --git a/cl_dll/CMakeLists.txt b/cl_dll/CMakeLists.txt
index 5402372a..6486cc9d 100644
--- a/cl_dll/CMakeLists.txt
+++ b/cl_dll/CMakeLists.txt
@@ -25,13 +25,7 @@ project (CLDLL)
 
 set (CLDLL_LIBRARY client)
 
-include(CheckIncludeFile)
-check_include_file("tgmath.h" HAVE_TGMATH_H)
-if(HAVE_TGMATH_H)
-	add_definitions(-DHAVE_TGMATH_H)
-endif()
-
-add_definitions(-DCLIENT_WEAPONS -DCLIENT_DLL)
+add_definitions(-DCLIENT_DLL)
 
 if(NOT MSVC)
 	add_compile_options(-fno-exceptions) # GCC/Clang flag
@@ -204,7 +198,7 @@ endif()
 set_target_properties (${CLDLL_LIBRARY} PROPERTIES
 	POSITION_INDEPENDENT_CODE 1)
 
-if(APPLE OR WIN32 OR ${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+if(NOT ${CMAKE_SYSTEM_NAME} STREQUAL "Android")
 	set(CLDLL_NAME "client")
 	set_target_properties(${CLDLL_LIBRARY} PROPERTIES
 		OUTPUT_NAME ${CLDLL_NAME}
diff --git a/dlls/CMakeLists.txt b/dlls/CMakeLists.txt
index 77cd47e6..7e5378e1 100644
--- a/dlls/CMakeLists.txt
+++ b/dlls/CMakeLists.txt
@@ -25,14 +25,6 @@ project (SVDLL)
 
 set (SVDLL_LIBRARY server)
 
-include(CheckIncludeFile)
-check_include_file("tgmath.h" HAVE_TGMATH_H)
-if(HAVE_TGMATH_H)
-	add_definitions(-DHAVE_TGMATH_H)
-endif()
-
-add_definitions(-DCLIENT_WEAPONS)
-
 if(NOT MSVC)
 	add_compile_options(-fno-exceptions) # GCC/Clang flag
 	add_compile_options(-Wno-invalid-offsetof) # GCC/Clang flag