Xserver/fb/fboverlay.c: Define -DMITSHM at build as it is used in fboverlay.c.

nx-X11/programs/Xserver/fb/Imakefile

@@ -6,6 +6,9 @@ NULL =
 FB_DEFINES=-DFBNOPIXADDR -DFBNO24BIT
 #endif
 
+#if HasShm
+SHM_DEFINES = ShmDefines
+#endif
 
 #if BuildRender
 RENDERSRC = fbcompose.c
@@ -116,6 +119,8 @@ MakeSubdirs($(SUBDIRS))
 DependSubdirs($(SUBDIRS))
 #endif
 
+SpecialCObjectRule(fboverlay,$(ICONFIGFILES),$(SHM_DEFINES))
+
 #ifdef LinkDirectory
 LinkSourceFile(fb24_32.c,LinkDirectory)
 LinkSourceFile(fballpriv.c,LinkDirectory)

nx-X11/programs/Xserver/fb/fboverlay.c

@@ -32,6 +32,10 @@
 #include "fb.h"
 #include "fboverlay.h"
 
+#ifdef MITSHM
+#include "shmint.h"
+#endif
+
 int	fbOverlayGeneration;
 int	fbOverlayScreenPrivateIndex = -1;