gcc47: error: conflicting declaration 'typedef enum pointer_t pointer_t'

[frits@…]

trying to install gcc47 on MacbookPro/2.3GHz i/Mac OS X 10.8.1, Xcode/gcc has been installed:

sudo port select gcc
Available versions for gcc:
	llvm-gcc42
	none (active)

sudo port clean gcc47
--->  Cleaning gcc47

sudo port install gcc47
--->  Computing dependencies for gcc47
--->  Fetching archive for gcc47
--->  Attempting to fetch gcc47-4.7.1_2.darwin_12.x86_64.tbz2 from http://mse.uk.packages.macports.org/sites/packages.macports.org/gcc47
--->  Attempting to fetch gcc47-4.7.1_2.darwin_12.x86_64.tbz2 from http://lil.fr.packages.macports.org/gcc47
--->  Attempting to fetch gcc47-4.7.1_2.darwin_12.x86_64.tbz2 from http://packages.macports.org/gcc47
--->  Fetching distfiles for gcc47
--->  Verifying checksum(s) for gcc47
--->  Extracting gcc47
--->  Applying patches to gcc47
--->  Configuring 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
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets
Error: Processing of port gcc47 failed