Hello, My autoconf version is Autoconf version 2.13; perhaps this bug has been previously corrected. In Info, at (autoconf)Compilers and Options and at (autoconf)Environment Variables, the environment variables examples don't work. Instead of ./configure CC=/usr/local2/bin/gcc it should be CC=/usr/local2/bin/gcc ./configure Have a nice day, -- fabrice bauzac Software should be free.