Source
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--- configure.ac.orig 2017-09-04 06:26:39.000000000 -0700
+++ configure.ac 2017-09-05 01:57:18.000000000 -0700
glibmm_have_cocoa=no
AC_MSG_CHECKING([for Mac OS X Cocoa support])
AC_PREPROC_IFELSE([AC_LANG_SOURCE([[
-#include <Cocoa/Cocoa.h>
+#error "Detected Mac OS X Cocoa support"
#ifdef GNUSTEP_BASE_VERSION
#error "Detected GNUstep, not Cocoa"
#endif