build: make sure pkg-config checks are guarded by an m4_ifdef

build-aux/m4/bitcoin_qt.m4

@@ -110,13 +110,8 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
   if test x$bitcoin_qt_got_major_vers = x5; then
     _BITCOIN_QT_IS_STATIC
     if test x$bitcoin_cv_static_qt = xyes; then
+      _BITCOIN_QT_FIND_STATIC_PLUGINS
       AC_DEFINE(QT_STATICPLUGIN, 1, [Define this symbol if qt plugins are static])
-      if test x$qt_plugin_path != x; then
-        QT_LIBS="$QT_LIBS -L$qt_plugin_path/platforms"
-      fi
-      if test x$use_pkgconfig = xyes; then
-        PKG_CHECK_MODULES([QTPLATFORM], [Qt5PlatformSupport], [QT_LIBS="$QTPLATFORM_LIBS $QT_LIBS"])
-      fi
       AC_CACHE_CHECK(for Qt < 5.4, bitcoin_cv_need_acc_widget,[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
           [[#include <QtCore>]],[[
           #if QT_VERSION >= 0x050400
@@ -127,25 +122,15 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
         [bitcoin_cv_need_acc_widget=no])
       ])
       if test "x$bitcoin_cv_need_acc_widget" = "xyes"; then
-        if test x$qt_plugin_path != x; then
-          QT_LIBS="$QT_LIBS -L$qt_plugin_path/accessible"
-        fi
         _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(AccessibleFactory)], [-lqtaccessiblewidgets])
       fi
       if test x$TARGET_OS = xwindows; then
         _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin)],[-lqwindows])
         AC_DEFINE(QT_QPA_PLATFORM_WINDOWS, 1, [Define this symbol if the qt platform is windows])
       elif test x$TARGET_OS = xlinux; then
-        PKG_CHECK_MODULES([X11XCB], [x11-xcb], [QT_LIBS="$X11XCB_LIBS $QT_LIBS"])
-        if ${PKG_CONFIG} --exists "Qt5Core >= 5.5" 2>/dev/null; then
-          PKG_CHECK_MODULES([QTXCBQPA], [Qt5XcbQpa], [QT_LIBS="$QTXCBQPA_LIBS $QT_LIBS"])
-        fi
         _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QXcbIntegrationPlugin)],[-lqxcb -lxcb-static])
         AC_DEFINE(QT_QPA_PLATFORM_XCB, 1, [Define this symbol if the qt platform is xcb])
       elif test x$TARGET_OS = xdarwin; then
-        if test x$use_pkgconfig = xyes; then
-          PKG_CHECK_MODULES([QTPRINT], [Qt5PrintSupport], [QT_LIBS="$QTPRINT_LIBS $QT_LIBS"])
-        fi
         AX_CHECK_LINK_FLAG([[-framework IOKit]],[QT_LIBS="$QT_LIBS -framework IOKit"],[AC_MSG_ERROR(could not iokit framework)])
         _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin)],[-lqcocoa])
         AC_DEFINE(QT_QPA_PLATFORM_COCOA, 1, [Define this symbol if the qt platform is cocoa])
@@ -154,10 +139,6 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
   else
     if test x$TARGET_OS = xwindows; then
       AC_DEFINE(QT_STATICPLUGIN, 1, [Define this symbol if qt plugins are static])
-      if test x$qt_plugin_path != x; then
-        QT_LIBS="$QT_LIBS -L$qt_plugin_path/accessible"
-        QT_LIBS="$QT_LIBS -L$qt_plugin_path/codecs"
-      fi
       _BITCOIN_QT_CHECK_STATIC_PLUGINS([
          Q_IMPORT_PLUGIN(qcncodecs)
          Q_IMPORT_PLUGIN(qjpcodecs)
@@ -297,6 +278,39 @@ AC_DEFUN([_BITCOIN_QT_CHECK_STATIC_PLUGINS],[
   LIBS="$CHECK_STATIC_PLUGINS_TEMP_LIBS"
 ])
 
+dnl Internal. Find paths necessary for linking qt static plugins
+dnl Inputs: bitcoin_qt_got_major_vers. 4 or 5.
+dnl Inputs: qt_plugin_path. optional.
+dnl Outputs: QT_LIBS is appended
+AC_DEFUN([_BITCOIN_QT_FIND_STATIC_PLUGINS],[
+  if test x$bitcoin_qt_got_major_vers = x5; then
+      if test x$qt_plugin_path != x; then
+        QT_LIBS="$QT_LIBS -L$qt_plugin_path/platforms"
+        if test -d "$qt_plugin_path/accessible"; then
+          QT_LIBS="$QT_LIBS -L$qt_plugin_path/accessible"
+        fi
+      fi
+     m4_ifdef([PKG_CHECK_MODULES],[
+     if test x$use_pkgconfig = xyes; then
+       PKG_CHECK_MODULES([QTPLATFORM], [Qt5PlatformSupport], [QT_LIBS="$QTPLATFORM_LIBS $QT_LIBS"])
+       if test x$TARGET_OS = xlinux; then
+         PKG_CHECK_MODULES([X11XCB], [x11-xcb], [QT_LIBS="$X11XCB_LIBS $QT_LIBS"])
+         if ${PKG_CONFIG} --exists "Qt5Core >= 5.5" 2>/dev/null; then
+           PKG_CHECK_MODULES([QTXCBQPA], [Qt5XcbQpa], [QT_LIBS="$QTXCBQPA_LIBS $QT_LIBS"])
+         fi
+       elif test x$TARGET_OS = xdarwin; then
+         PKG_CHECK_MODULES([QTPRINT], [Qt5PrintSupport], [QT_LIBS="$QTPRINT_LIBS $QT_LIBS"])
+       fi
+     fi
+     ])
+  else
+    if test x$qt_plugin_path != x; then
+      QT_LIBS="$QT_LIBS -L$qt_plugin_path/accessible"
+      QT_LIBS="$QT_LIBS -L$qt_plugin_path/codecs"
+    fi
+  fi
+])
+
 dnl Internal. Find Qt libraries using pkg-config.
 dnl Inputs: bitcoin_qt_want_version (from --with-gui=). The version to check
 dnl         first.