firefox-5.0 lacks media-libs/mesa for webm flag. Here's essential part of build output: checking for GL/glx.h... no configure: error: Can't find header GL/glx.h for WebGL (install mesa-common-dev (Ubuntu), mesa-libGL-devel (Fedora), or Mesa-devel (openSUSE)) *** Fix above errors and then restart with "make -f client.mk build" Reproducible: Always
Created attachment 278409 [details] build.log
Mesa isn't needed for webm, it's needed for webgl. I've added the dependency, thanks for reporting!