glxfb.c: In function '__glXFBMemSwapBuffers':
 glxfb.c:117:5: warning: pointer targets in passing argument 10 of 'pGC->ops->PutImage' differ in signedness [-Wpointer-sign]
      buf);
      ^~~
 glxfb.c:117:5: note: expected 'char *' but argument is of type 'GLubyte * {aka unsigned char *}'