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gcc -o gtk-opengl.elf gtk-opengl.c `pkg-config --cflags gtk+-3.0` -lGL -lgtk-3 -lgdk-3 -lgobject-2.0 -no-pie -fno-plt -Os -std=gnu11 -nostartfiles -nostdlib
gtk-opengl.c: In function ‘on_realize’:
gtk-opengl.c:62:23: warning: passing argument 3 of ‘glShaderSource’ from incompatible pointer type [-Wincompatible-pointer-types]
  glShaderSource(v, 1, &vshader, NULL);
                       ^
In file included from /usr/include/GL/gl.h:2055:0,
                 from gtk-opengl.c:11:
/usr/include/GL/glext.h:777:21: note: expected ‘const GLchar * const* {aka const char * const*}’ but argument is of type ‘char **’
 GLAPI void APIENTRY glShaderSource (GLuint shader, GLsizei count, const GLchar *const*string, const GLint *length);
                     ^~~~~~~~~~~~~~
gtk-opengl.c: In function ‘_start’:
gtk-opengl.c:134:2: warning: ‘gdk_cursor_new’ is deprecated [-Wdeprecated-declarations]
  GdkCursor* Cursor = gdk_cursor_new(GDK_BLANK_CURSOR);
  ^~~~~~~~~
In file included from /usr/include/gtk-3.0/gdk/gdk.h:34:0,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from gtk-opengl.c:9:
/usr/include/gtk-3.0/gdk/gdkcursor.h:228:12: note: declared here
 GdkCursor* gdk_cursor_new   (GdkCursorType    cursor_type);
            ^~~~~~~~~~~~~~
/usr/bin/ld: /tmp/cchKw7fs.o: undefined reference to symbol 'exit@@GLIBC_2.2.5'
//lib/x86_64-linux-gnu/libc.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
Makefile:17: recipe for target 'gtk-opengl.elf' failed
make: *** [gtk-opengl.elf] Error 1