[root@localhost gaim-1.1.1]# CC=c89 CFLAGS=-O2 LIBS=-lposix ./configure
checking build system type... i686-redhat-linux-gnu
checking host system type... i686-redhat-linux-gnu
checking target system type... i686-redhat-linux-gnu
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for sed... /bin/sed
checking for gcc... c89
checking for C compiler default output file name... configure: error: C compiler cannot create executables
See `config.log' for more details.
[root@localhost gaim-1.1.1]#