Autotools does not detect my architecture correctly. How to handle?

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http://unix.stackexchange.com – I am trying to build the latest ffmpeg from the git repo. However, as you can see below, autotools does not detect correctly that my box has 64-bit architecture (Ubuntu 12.04). Consequently, during the build, some x86 libs are required, but not present, and the build fails. How do I tackle this? mvitkov@mms:~/projects/ffmpeg/build$ ../ffmpeg/configure --enable-shared output: install prefix /usr/local source path /home/users/mvitkov/projects/ffmpeg/ffmpeg C compiler gcc ARCH x86 (generic) On the other hand, autotools (HowTos)