perl Makefile.PL make ... cc -c -Iinclude -Iinclude/generic -I/opt/X11/include -I/opt/X11/include/freetype2 -I/opt/X11/include/cairo -I/opt/X11/include/pixman-1 -I/opt/X11/include/libpng16 -I/Library/Frameworks/Mono.framework/Versions/4.8.1/include/gtk-2.0 -I/Library/Frameworks/Mono.framework/Versions/4.8.1/lib/gtk-2.0/include -I/Library/Frameworks/Mono.framework/Versions/4.8.1/include/atk-1.0 -I/Library/Frameworks/Mono.framework/Versions/4.8.1/include/gdk-pixbuf-2.0 -I/Library/Frameworks/Mono.framework/Versions/4.8.1/include/pango-1.0 -I/Library/Frameworks/Mono.framework/Versions/4.8.1/include/glib-2.0 -I/Library/Frameworks/Mono.framework/Versions/4.8.1/lib/glib-2.0/include -I/Library/Frameworks/Mono.framework/Versions/4.8.1/include -I/Library/Frameworks/Mono.framework/Versions/4.8.1/include/libpng14 -arch i386 -arch x86_64 -g -pipe -fno-common -DPERL_DARWIN -fno-strict-aliasing -fstack-protector -Os -DVERSION=\"1.51\" -DXS_VERSION=\"1.51\" "-I/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE" unix/gtk.c -o unix/gtk.o unix/gtk.c:15:10: fatal error: 'gdk/gdkx.h' file not found #include ^ 1 error generated. make: *** [unix/gtk.o] Error 1 #### PATH=$PATH:/Library/Frameworks/Mono.framework/Versions/4.8.1/bin