lfs@lfslivecd /mnt/lfs/sources/gcc-build: ../gcc-3.4.3/configure --prefix=/tools \
>     --libexecdir=/tools/lib --with-local-prefix=/tools \
>     --disable-nls --enable-shared --enable-languages=c
loading cache ./config.cache
checking host system type... i686-pc-linux-gnu
checking target system type... i686-pc-linux-gnu
checking build system type... i686-pc-linux-gnu
checking for a BSD compatible install... /usr/bin/install -c
*** This configuration is not supported in the following subdirectories:
     target-libstdc++-v3 target-libf2c target-libffi target-boehm-gc target-zlib target-libjava zlib fastjar target-libobjc
    (Any other directories should still work fine.)
/tools/bin/ld: warning: ld-linux.so.2, needed by /lib/libc.so.6, not found (try using -rpath or -rpath-link)
/lib/libc.so.6: undefined reference to `_rtld_global@GLIBC_PRIVATE'
/lib/libc.so.6: undefined reference to `__libc_enable_secure@GLIBC_PRIVATE'
/lib/libc.so.6: undefined reference to `__libc_stack_end@GLIBC_2.1'
/lib/libc.so.6: undefined reference to `_rtld_global_ro@GLIBC_PRIVATE'
/lib/libc.so.6: undefined reference to `_dl_out_of_memory@GLIBC_PRIVATE'
/lib/libc.so.6: undefined reference to `___tls_get_addr@GLIBC_2.3'
/lib/libc.so.6: undefined reference to `_r_debug@GLIBC_2.0'
/lib/libc.so.6: undefined reference to `_dl_argv@GLIBC_PRIVATE'
collect2: ld returned 1 exit status
*** The command 'gcc -o conftest -g -O2   conftest.c' failed.
*** You must set the environment variable CC to a working compiler.

gcc