arch fails to build on ppc: error: #error memmove does not exist on this platform, nor is a substitute available

[barracuda156]

/bin/sh ./libtool --silent --mode=compile /usr/bin/gcc-4.2 -pipe -Os -arch ppc -Wall -Wmissing-prototypes -Wstrict-prototypes -fexceptions -DHAVE_EXPAT_CONFIG_H  -I/opt/local/include -DHAVE_EXPAT_CONFIG_H -DHAVE_EXPAT_CONFIG_H -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_arch/arch/work/tla-1.3.5/src/expat/lib -I. -o lib/xmlparse.lo -c /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_arch/arch/work/tla-1.3.5/src/expat/lib/xmlparse.c
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_arch/arch/work/tla-1.3.5/src/expat/lib/xmlparse.c:75:2: error: #error memmove does not exist on this platform, nor is a substitute available
make[1]: *** [lib/xmlparse.lo] Error 1
make[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_arch/arch/work/tla-1.3.5/src/=build/expat'
make: *** [all] Error 2