I tried to build mesa 7.10 on Debian and had a failure that appears to be the inclusion of $(TALLOC_LIBS) in src/mesa/drivers/osmesa/Makefile
Removing $(TALLOC_LIBS) allowed the build process to complete.
I suggested to revert commit 5a3ac74 in http://lists.freedesktop.org/archives/mesa-dev/2010-October/003664.html and Julien agreed in http://lists.freedesktop.org/archives/mesa-dev/2011-January/004666.html but nothing has happened...
Can you test Mesa git as of commit 7d6abd254a46e37a27401c3ae0ce0645d8b0decd?
I did a git reset --hard followed by git pull and the source then rebuilt successfully.
OK, closing this bug.