While using macports to install gtkglext on Leopard I ran into this error: ... checking for GL/glu.h... yes checking for glVertex3d in -lGLcore... no checking for glVertex3d in -lGL... no checking for glVertex3f in -lGL... no checking for glVertex3i in -lGL... no checking for glVertex3s in -lGL... no checking for glVertex3d in -lMesaGL... no configure: error: Cannot find GL library Error: Status 1 encountered during processing Looking at the config.log file I have found that it is failing due to this bug: http://developer.apple.com/qa/qa2007/qa1567.html Then reading the gtkglext manual I tried to run the configure script with the flag: --with-gl-libdir=/System/Library/Frameworks/OpenGL.framework/Versions/ A/Libraries This enabled the installation to work. I have filled out a bug report on macosforge in the macports section as well. While all this is fine and good, I can still not get macports to know I installed gtkglext so it tries and fails. My question is two-fold. First is there a way for me to pass the flag above to macports during the installation of gtkglext? Does anyone want to give fixing this port a stab? I have tried, but haven't been able to figure it out so far. I will keep trying, but just thought I'd ask. Thanks a lot, -mike