apple-gcc42 failed to compile: conflicting types for 'psignal'

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I was trying to install mkvutoolnix but the installation stopped when compiling apple-gcc42. I'm on a core i7 macbook air (2011) with Lion.

$ uname -a
Darwin MacBook-Air.local 11.2.0 Darwin Kernel Version 11.2.0: Tue Aug  9 20:54:00 PDT 2011; root:xnu-1699.24.8~1/RELEASE_X86_64 x86_64

$ xcodebuild -version
Xcode 4.2
Build version 4D199

I'm attaching the complete log file, here's the first error I see:

info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_apple-gcc42/apple-gcc42/work/objroot/src/libiberty/strsignal.c:552:1: error: conflicting types for 'psignal'
:info:build psignal (unsigned signo, char *message)
:info:build ^
:info:build /usr/include/signal.h:105:6: note: previous declaration is here
:info:build void    psignal(unsigned int, const char *);
:info:build         ^
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_apple-gcc42/apple-gcc42/work/objroot/src/libiberty/strsignal.c:558:30: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare]
:info:build   if ((signo <= 0) || (signo >= sys_nsig))
:info:build                        ~~~~~ ^  ~~~~~~~~
:info:build 1 warning and 1 error generated.
:info:build make[4]: *** [strsignal.o] Error 1
:info:build make[4]: *** Waiting for unfinished jobs....
:info:build make[5]: Nothing to be done for `all'.
:info:build make[3]: *** [all-stage1-libiberty] Error 2
:info:build make[2]: *** [stage1-bubble] Error 2
:info:build make[1]: *** [all] Error 2
:info:build + exit 1
:info:build make: *** [install] Error 1
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_apple-gcc42/apple-gcc42/work/gcc-5666.3'

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Cc Me!