diff --git a/include/cglm-opengl.h b/include/cglm-opengl.h
index c1aa863..ecb42db 100644
--- a/include/cglm-opengl.h
+++ b/include/cglm-opengl.h
@@ -8,8 +8,26 @@
 #ifndef cglm_mat_opengl_h
 #define cglm_mat_opengl_h
 
+#ifdef __APPLE__
+#  include <OpenGL/gl3.h>
+#else
+#  ifdef _WIN32
+#    include <windows.h>
+#  endif
+#  include <GL/gl.h>
+#endif
+
 #include "cglm.h"
 
+#ifdef _WIN32
+extern
+void
+glUniformMatrix4fv(GLint location,
+                   GLsizei count,
+                   GLboolean transpose,
+                   const GLfloat *value);
+#endif
+
 CGLM_INLINE
 void
 glm_mat4_uniform(mat4 m, GLint location){