libkms: Make vmwgfx optional
diff --git a/libkms/Makefile.am b/libkms/Makefile.am
index d65d601..62d154b 100644
--- a/libkms/Makefile.am
+++ b/libkms/Makefile.am
@@ -8,8 +8,11 @@
 libkms_la_LIBADD =
 
 libkms_la_SOURCES = \
-	api.c \
-	vmwgfx.c
+	api.c
+
+if HAVE_VMWGFX
+libkms_la_SOURCES += vmwgfx.c
+endif
 
 libkmsincludedir = ${includedir}/libkms
 libkmsinclude_HEADERS = libkms.h