Build failure on OSX

Version

macOS Sierra Version 1.12.4

1st Problem

In cmake/FindGtkGlExt.cmake, it's searching for gtkglext-x11-1.0 when it should be searching for gtkglext-1.0.

[ 70%] Building CXX object libs/gtkutil/CMakeFiles/gtkutil.dir/glwidget.cpp.o
At revision 138.
/Users/viroemer/Devel/wtfbbqhax/ghub/netradiant/libs/gtkutil/glwidget.cpp:31:10: fatal error: 'gtk/gtkglwidget.h'
      file not found
#include <gtk/gtkglwidget.h>
         ^
1 error generated.

2nd Problem

I dunno how to fix this one

/Users/viroemer/Devel/wtfbbqhax/ghub/netradiant/radiant/qgl.cpp:62:10: fatal error: 'gdk/gdkx.h' file not found
#include <gdk/gdkx.h>
         ^
1 error generated.

3rd Problem

Or this one

/Users/viroemer/Devel/wtfbbqhax/ghub/netradiant/radiant/server.cpp:154:44: error: use of undeclared identifier
      'RTLD_DEEPBIND'
        m_library = dlopen( filename, RTLD_NOW | (RTLD_DEEPBIND + 0) );