Такая проблема:
стоял gcc 3.4.3, ради интереса поставил gcc 4.0. После этого захотел обратно 3.4.3, сделал remomovepkg gcc*, установил по новой 3.4.3, теперь ничего не работает:
root@linux:/distrib/cvs/fluxbox# ./configure --prefix=/usr
checking for a BSD-compatible install... /usr/local/bin/ginstall -c
checking whether build environment is sane... yes
/distrib/cvs/fluxbox/missing: Unknown `--run' option
Try `/distrib/cvs/fluxbox/missing --help' for more information
configure: WARNING: `missing' script is too old or missing
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... configure: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details.