mumble-1.21 Build failure

[boydb@…]

Attempting to build mumble on an Intel Mac running 10.3.9:

$ sudo port install mumble
--->  Computing dependencies for mumble
--->  Building mumble
Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_mumble/work/mumble-1.2.1" && /usr/bin/make -j1 all " returned error 2
Command output: cd speexbuild/ && /usr/bin/make -f Makefile all
/usr/bin/make -f Makefile.Release all
/usr/bin/gcc-4.2 -c -pipe -Wfatal-errors -Wshadow -Wconversion -Wsign-compare -fvisibility=hidden -mmacosx-version-min=10.4 -Xarch_i386 -mmmx -Xarch_i386 -msse -Xarch_i386 -msse2 -O2 -fPIC -w -arch i386 -isysroot /SDKs/MacOSX10.5.sdk -DNO_UPDATE_CHECK -DRESTRICT=__restrict__ -DNDEBUG -DHAVE_CONFIG_H -I/opt/local/libexec/qt4-mac/mkspecs/macx-g++ -I. -I../speex/include -I../speex/libspeex -I../speexbuild -o release/mdf.o ../speex/libspeex/mdf.c
make[2]: /usr/bin/gcc-4.2: Command not found
make[2]: *** [release/mdf.o] Error 127
make[1]: *** [release-all] Error 2
make: *** [sub-speexbuild-all-ordered] Error 2

Error: Status 1 encountered during processing.

$ sudo port -d install mumble
... snip ...
--->  Building mumble
DEBUG: Executing proc-pre-org.macports.build-build-0
DEBUG: Executing org.macports.build (mumble)
DEBUG: Environment: MACOSX_DEPLOYMENT_TARGET='10.4' QMAKESPEC='/opt/local/libexec/qt4-mac/mkspecs/macx-g++'
DEBUG: Assembled command: 'cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_mumble/work/mumble-1.2.1" && /usr/bin/make -j1 all'
cd speexbuild/ && /usr/bin/make -f Makefile all
/usr/bin/make -f Makefile.Release all
/usr/bin/gcc-4.2 -c -pipe -Wfatal-errors -Wshadow -Wconversion -Wsign-compare -fvisibility=hidden -mmacosx-version-min=10.4 -Xarch_i386 -mmmx -Xarch_i386 -msse -Xarch_i386 -msse2 -O2 -fPIC -w -arch i386 -isysroot /SDKs/MacOSX10.5.sdk -DNO_UPDATE_CHECK -DRESTRICT=__restrict__ -DNDEBUG -DHAVE_CONFIG_H -I/opt/local/libexec/qt4-mac/mkspecs/macx-g++ -I. -I../speex/include -I../speex/libspeex -I../speexbuild -o release/mdf.o ../speex/libspeex/mdf.c
make[2]: /usr/bin/gcc-4.2: Command not found
make[2]: *** [release/mdf.o] Error 127
make[1]: *** [release-all] Error 2
make: *** [sub-speexbuild-all-ordered] Error 2
Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_mumble/work/mumble-1.2.1" && /usr/bin/make -j1 all " returned error 2
DEBUG: Backtrace: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_mumble/work/mumble-1.2.1" && /usr/bin/make -j1 all " returned error 2
    while executing
"command_exec build"
    (procedure "portbuild::build_main" line 9)
    invoked from within
"$procedure $targetname"
Warning: the following items did not execute (for mumble): org.macports.activate org.macports.build org.macports.destroot org.macports.install
Error: Status 1 encountered during processing.

Not sure where the actual error is being thrown, though this is the second error in the build process; building the qt4-mac dependency on this 10.3.9 box generated an error as outlined in ​this bug, and was worked around as per my comment there.