Dear All, I've spent a lot of time trying to follow to the instructions on how to build from source (http://wiki.winehq.org/MacOSX/Building). wine-1.3.21. Finally, I found this discussion: MAC OS X compile -> 'OpenGL development headers not found (http://forum.winehq.org/viewtopic.php?t=6035). I believe the best way to include X11 headers and libraries is to run configure as follows: For native X11 ./configure --x-includes=/usr/X11/include --x-libraries=/usr/X11/lib For XQuartz ./configure --x-includes=/opt/X11/include --x-libraries=/opt/X11/lib I am far from programming these days. Is it a bug on Makefile? Or shall I ask to update the guide? Best regards, John