coreutils @9.3: tiger build error: signal.h: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'mcontext64_t'

[barracuda156]

mv -f lib/.deps/libcoreutils_a-areadlinkat-with-size.Tpo lib/.deps/libcoreutils_a-areadlinkat-with-size.Po
/opt/local/bin/gcc-apple-4.2 -std=gnu99  -I. -I./lib  -Ilib -I./lib -Isrc -I./src -I/opt/local/include   -Wno-cast-qual -Wno-conversion -Wno-float-equal -Wno-sign-compare -Wno-undef -Wno-unused-function -Wno-unused-parameter -pipe -Os -arch ppc -MT lib/libcoreutils_a-argmatch.o -MD -MP -MF lib/.deps/libcoreutils_a-argmatch.Tpo -c -o lib/libcoreutils_a-argmatch.o `test -f 'lib/argmatch.c' || echo './'`lib/argmatch.c
In file included from /usr/include/sys/wait.h:110,
                 from ./lib/sys/wait.h:28,
                 from /usr/include/stdlib.h:64,
                 from ./lib/stdlib.h:36,
                 from lib/gettext.h:202,
                 from lib/argmatch.h:30,
                 from lib/argmatch.c:25:
/usr/include/sys/signal.h:145: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'mcontext64_t'
/usr/include/sys/signal.h:177: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'ucontext64_t'
make[2]: *** [lib/libcoreutils_a-argmatch.o] Error 1