gcc47 @4.7.1_4 Build error - libtool version error

[kkchen@…]

I'm running Mac OS 10.8.1 with Xcode 4.4.1. Upon doing a port install gcc47, I get

--->  Computing dependencies for gcc47
--->  Building gcc47
Error: org.macports.build for port gcc47 returned: command execution failed
Please see the log file for port gcc47 for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc47/gcc47/main.log

In the log file, the first error that pops up is

:info:build /bin/sh ./libtool --tag=CC   --mode=compile /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc47/gcc47/work/build/./gcc/xgcc -B/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc47/gcc47/work/build/./gcc/ -B/opt/local/x86_64-apple-darwin12/bin/ -B/opt/local/x86_64-apple-darwin12/lib/ -isystem /opt/local/x86_64-apple-darwin12/include -isystem /opt/local/x86_64-apple-darwin12/sys-include    -DHAVE_CONFIG_H -I. -I../../../gcc-4.7.1/libgomp  -I../../../gcc-4.7.1/libgomp/config/bsd -I../../../gcc-4.7.1/libgomp/config/posix -I../../../gcc-4.7.1/libgomp  -Wall -Werror -Wc,-pthread -g -pipe -O2 -MT alloc.lo -MD -MP -MF .deps/alloc.Tpo -c -o alloc.lo ../../../gcc-4.7.1/libgomp/alloc.c
:info:build ./libtool: line 533: CDPATH: command not found
:info:build libtool: Version mismatch error.  This is libtool 2.2.7a, but the
:info:build libtool: definition of this LT_INIT comes from an older release.
:info:build libtool: You should recreate aclocal.m4 with macros from libtool 2.2.7a
:info:build libtool: and run autoconf again.
:info:build make[5]: *** [alloc.lo] Error 63

The full log is attached.

[kkchen@…]

Build log

[jeremyhu@…]

Have you done something "special" with your system wrt libtool?

Please 'sudo port -v clean gcc47' and try again. If it fails, attach the full build log.

[kkchen@…]

That seems to have fixed it; thanks.

Originally I had only done

port -fp uninstall installed
port install gcc47

but I forgot about the cleaning step.