diff --git a/direct/src/p3d/FileSpec.py b/direct/src/p3d/FileSpec.py
index f6ca6b93d0..ddd1dafd6e 100644
--- a/direct/src/p3d/FileSpec.py
+++ b/direct/src/p3d/FileSpec.py
@@ -33,7 +33,7 @@ class FileSpec:
         if st is None:
             st = os.stat(pathname.toOsSpecific())
         self.size = st.st_size
-        self.timestamp = st.st_mtime
+        self.timestamp = int(st.st_mtime)
 
         self.readHash(pathname)
 
@@ -124,7 +124,7 @@ class FileSpec:
                 self.__correctHash(packageDir, pathname, st, notify)
             return False
 
-        if st.st_mtime == self.timestamp:
+        if int(st.st_mtime) == self.timestamp:
             # If the size is right and the timestamp is right, the
             # file passes.
             if notify:
@@ -198,7 +198,7 @@ class FileSpec:
         # The hash is OK.  If the timestamp is wrong, change it back
         # to what we expect it to be, so we can quick-verify it
         # successfully next time.
-        if st.st_mtime != self.timestamp:
+        if int(st.st_mtime) != self.timestamp:
             self.__updateTimestamp(pathname, st)
 
         return True
@@ -219,7 +219,7 @@ class FileSpec:
         if notify:
             notify.info("Correcting timestamp of %s to %d (%s)" % (
                 self.filename, st.st_mtime, time.asctime(time.localtime(st.st_mtime))))
-        self.timestamp = st.st_mtime
+        self.timestamp = int(st.st_mtime)
 
     def checkHash(self, packageDir, pathname, st):
         """ Returns true if the file has the expected md5 hash, false
diff --git a/panda/src/glstuff/panda_glext.h b/panda/src/glstuff/panda_glext.h
index 61b983ed7a..3be88b13c5 100644
--- a/panda/src/glstuff/panda_glext.h
+++ b/panda/src/glstuff/panda_glext.h
@@ -4493,8 +4493,6 @@ GLAPI void APIENTRY glVertexBlendARB (GLint count);
 
 #ifndef GL_ARB_vertex_buffer_object
 #define GL_ARB_vertex_buffer_object 1
-typedef ptrdiff_t GLsizeiptrARB;
-typedef ptrdiff_t GLintptrARB;
 #define GL_BUFFER_SIZE_ARB                0x8764
 #define GL_BUFFER_USAGE_ARB               0x8765
 #define GL_ARRAY_BUFFER_ARB               0x8892
@@ -4530,9 +4528,9 @@ typedef void (APIENTRYP PFNGLBINDBUFFERARBPROC) (GLenum target, GLuint buffer);
 typedef void (APIENTRYP PFNGLDELETEBUFFERSARBPROC) (GLsizei n, const GLuint *buffers);
 typedef void (APIENTRYP PFNGLGENBUFFERSARBPROC) (GLsizei n, GLuint *buffers);
 typedef GLboolean (APIENTRYP PFNGLISBUFFERARBPROC) (GLuint buffer);
-typedef void (APIENTRYP PFNGLBUFFERDATAARBPROC) (GLenum target, GLsizeiptrARB size, const void *data, GLenum usage);
-typedef void (APIENTRYP PFNGLBUFFERSUBDATAARBPROC) (GLenum target, GLintptrARB offset, GLsizeiptrARB size, const void *data);
-typedef void (APIENTRYP PFNGLGETBUFFERSUBDATAARBPROC) (GLenum target, GLintptrARB offset, GLsizeiptrARB size, void *data);
+typedef void (APIENTRYP PFNGLBUFFERDATAARBPROC) (GLenum target, GLsizeiptr size, const void *data, GLenum usage);
+typedef void (APIENTRYP PFNGLBUFFERSUBDATAARBPROC) (GLenum target, GLintptr offset, GLsizeiptr size, const void *data);
+typedef void (APIENTRYP PFNGLGETBUFFERSUBDATAARBPROC) (GLenum target, GLintptr offset, GLsizeiptr size, void *data);
 typedef void *(APIENTRYP PFNGLMAPBUFFERARBPROC) (GLenum target, GLenum access);
 typedef GLboolean (APIENTRYP PFNGLUNMAPBUFFERARBPROC) (GLenum target);
 typedef void (APIENTRYP PFNGLGETBUFFERPARAMETERIVARBPROC) (GLenum target, GLenum pname, GLint *params);
@@ -4542,9 +4540,9 @@ GLAPI void APIENTRY glBindBufferARB (GLenum target, GLuint buffer);
 GLAPI void APIENTRY glDeleteBuffersARB (GLsizei n, const GLuint *buffers);
 GLAPI void APIENTRY glGenBuffersARB (GLsizei n, GLuint *buffers);
 GLAPI GLboolean APIENTRY glIsBufferARB (GLuint buffer);
-GLAPI void APIENTRY glBufferDataARB (GLenum target, GLsizeiptrARB size, const void *data, GLenum usage);
-GLAPI void APIENTRY glBufferSubDataARB (GLenum target, GLintptrARB offset, GLsizeiptrARB size, const void *data);
-GLAPI void APIENTRY glGetBufferSubDataARB (GLenum target, GLintptrARB offset, GLsizeiptrARB size, void *data);
+GLAPI void APIENTRY glBufferDataARB (GLenum target, GLsizeiptr size, const void *data, GLenum usage);
+GLAPI void APIENTRY glBufferSubDataARB (GLenum target, GLintptr offset, GLsizeiptr size, const void *data);
+GLAPI void APIENTRY glGetBufferSubDataARB (GLenum target, GLintptr offset, GLsizeiptr size, void *data);
 GLAPI void *APIENTRY glMapBufferARB (GLenum target, GLenum access);
 GLAPI GLboolean APIENTRY glUnmapBufferARB (GLenum target);
 GLAPI void APIENTRY glGetBufferParameterivARB (GLenum target, GLenum pname, GLint *params);
@@ -10881,7 +10879,7 @@ GLAPI void APIENTRY glGetVertexAttribIuivEXT (GLuint index, GLenum pname, GLuint
 #define GL_VIDEO_CAPTURE_FIELD_LOWER_HEIGHT_NV 0x903B
 #define GL_VIDEO_CAPTURE_SURFACE_ORIGIN_NV 0x903C
 typedef void (APIENTRYP PFNGLBEGINVIDEOCAPTURENVPROC) (GLuint video_capture_slot);
-typedef void (APIENTRYP PFNGLBINDVIDEOCAPTURESTREAMBUFFERNVPROC) (GLuint video_capture_slot, GLuint stream, GLenum frame_region, GLintptrARB offset);
+typedef void (APIENTRYP PFNGLBINDVIDEOCAPTURESTREAMBUFFERNVPROC) (GLuint video_capture_slot, GLuint stream, GLenum frame_region, GLintptr offset);
 typedef void (APIENTRYP PFNGLBINDVIDEOCAPTURESTREAMTEXTURENVPROC) (GLuint video_capture_slot, GLuint stream, GLenum frame_region, GLenum target, GLuint texture);
 typedef void (APIENTRYP PFNGLENDVIDEOCAPTURENVPROC) (GLuint video_capture_slot);
 typedef void (APIENTRYP PFNGLGETVIDEOCAPTUREIVNVPROC) (GLuint video_capture_slot, GLenum pname, GLint *params);
@@ -10894,7 +10892,7 @@ typedef void (APIENTRYP PFNGLVIDEOCAPTURESTREAMPARAMETERFVNVPROC) (GLuint video_
 typedef void (APIENTRYP PFNGLVIDEOCAPTURESTREAMPARAMETERDVNVPROC) (GLuint video_capture_slot, GLuint stream, GLenum pname, const GLdouble *params);
 #ifdef GL_GLEXT_PROTOTYPES
 GLAPI void APIENTRY glBeginVideoCaptureNV (GLuint video_capture_slot);
-GLAPI void APIENTRY glBindVideoCaptureStreamBufferNV (GLuint video_capture_slot, GLuint stream, GLenum frame_region, GLintptrARB offset);
+GLAPI void APIENTRY glBindVideoCaptureStreamBufferNV (GLuint video_capture_slot, GLuint stream, GLenum frame_region, GLintptr offset);
 GLAPI void APIENTRY glBindVideoCaptureStreamTextureNV (GLuint video_capture_slot, GLuint stream, GLenum frame_region, GLenum target, GLuint texture);
 GLAPI void APIENTRY glEndVideoCaptureNV (GLuint video_capture_slot);
 GLAPI void APIENTRY glGetVideoCaptureivNV (GLuint video_capture_slot, GLenum pname, GLint *params);