Fixed building with cmake when fcitx isn't installed

CMakeLists.txt

@@ -916,6 +916,8 @@ elseif(UNIX AND NOT APPLE)
       endif()
     endif()
 
+    check_include_file("fcitx/frontend.h" HAVE_FCITX_FRONTEND_H)
+
   endif()
 
   if(INPUT_TSLIB)

include/SDL_config.h.cmake

@@ -82,6 +82,7 @@
 #cmakedefine HAVE_LIBUDEV_H 1
 #cmakedefine HAVE_DBUS_DBUS_H 1
 #cmakedefine HAVE_IBUS_IBUS_H 1
+#cmakedefine HAVE_FCITX_FRONTEND_H 1
 
 /* C library functions */
 #cmakedefine HAVE_MALLOC 1

src/core/linux/SDL_fcitx.c

@@ -18,6 +18,9 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
+#include "SDL_config.h"
+
+#ifdef HAVE_FCITX_FRONTEND_H
 
 #include <fcitx/frontend.h>
 #include <unistd.h>
@@ -545,4 +548,6 @@ SDL_Fcitx_PumpEvents()
     }
 }
 
+#endif /* HAVE_FCITX_FRONTEND_H */
+
 /* vi: set ts=4 sw=4 expandtab: */