diff --git a/panda/src/glstuff/Sources.pp b/panda/src/glstuff/Sources.pp
index be2c74c16d..c71d13baf7 100644
--- a/panda/src/glstuff/Sources.pp
+++ b/panda/src/glstuff/Sources.pp
@@ -1,5 +1,5 @@
 #define OTHER_LIBS interrogatedb:c dconfig:c dtoolconfig:m \
-                   dtoolutil:c dtoolbase:c dtool:m
+                   dtoolutil:c dtoolbase:c dtool:m prc:c
 #define USE_PACKAGES gl cggl
 // Most of the files here are not actually compiled into anything;
 // they're just included by various other directories.
diff --git a/panda/src/glstuff/glGraphicsStateGuardian_src.h b/panda/src/glstuff/glGraphicsStateGuardian_src.h
index b9f04bc7f0..f1867a7336 100644
--- a/panda/src/glstuff/glGraphicsStateGuardian_src.h
+++ b/panda/src/glstuff/glGraphicsStateGuardian_src.h
@@ -59,6 +59,13 @@ typedef void (APIENTRYP PFNGLMULTITEXCOORD4FPROC) (GLenum target, const GLfloat
 typedef void (APIENTRYP PFNGLBLENDEQUATIONPROC) (GLenum mode);
 typedef void (APIENTRYP PFNGLBLENDCOLORPROC) (GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
 typedef void (APIENTRYP PFNGLCLIENTACTIVETEXTUREPROC) (GLenum texture);
+typedef void (APIENTRYP PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
+typedef void (APIENTRYP PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
+typedef void (APIENTRYP PFNGLBUFFERSUBDATAPROC) (GLenum target, GLintptr offset, GLsizeiptr size, const GLvoid *data);
+typedef void (APIENTRYP PFNGLDRAWBUFFERSARBPROC) (GLsizei n, const GLenum *bufs);
+typedef void (APIENTRYP PFNGLBUFFERDATAPROC) (GLenum target, GLsizeiptr size, const GLvoid *data, GLenum usage);
+typedef void (APIENTRYP PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint *buffers);
+
 class CLP(GeomContext);
 
 ////////////////////////////////////////////////////////////////////
diff --git a/panda/src/glstuff/glstuff_src.h b/panda/src/glstuff/glstuff_src.h
index 4fe0b51587..458db2feae 100644
--- a/panda/src/glstuff/glstuff_src.h
+++ b/panda/src/glstuff/glstuff_src.h
@@ -43,11 +43,14 @@
 #if defined(GL_GLEXT_VERSION) && GL_GLEXT_VERSION < 29
   #undef GL_GLEXT_VERSION
   #undef GL_GLEXT_PROTOTYPES
+#ifndef IS_OSX
   #undef GL_VERSION_1_2
   #undef GL_VERSION_1_3
   #undef GL_VERSION_1_4
   #undef GL_VERSION_1_5
 #endif
+#endif
+
 #include "panda_glext.h"
 
 #include "glmisc_src.h"