$ ./configure --target=sh4-linux --prefix=/usr/local --without-headers --with-newlib --disable-shared --enable-languages=c
[---SNIP---]
$ make all-gcc
/home/james/develop/my/dc-linux-homebrew/bin/build-gcc/./gcc/xgcc -B/home/james/develop/my/dc-linux-homebrew/bin/build-gcc/./gcc/ -B/usr/local/sh4-linux/bin/ -B/usr/local/sh4-linux/lib/ -isystem /usr/local/sh4-linux/include -isystem /usr/local/sh4-linux/sys-include -O2  -O2 -g -O2  -DIN_GCC -DCROSS_COMPILE   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem ./include  -fpic -DNO_FPSCR_VALUES -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -Dinhibit_libc -I. -I. -I../../gcc-4.1.1/gcc -I../../gcc-4.1.1/gcc/. -I../../gcc-4.1.1/gcc/../include -I../../gcc-4.1.1/gcc/../libcpp/include   -fexceptions -c ../../gcc-4.1.1/gcc/unwind-dw2.c -o libgcc/./unwind-dw2.o
In file included from ./gthr-default.h:1,
                 from ../../gcc-4.1.1/gcc/gthr.h:114,
                 from ../../gcc-4.1.1/gcc/unwind-dw2.c:42:
../../gcc-4.1.1/gcc/gthr-posix.h:43:21: error: pthread.h: No such file or directory
../../gcc-4.1.1/gcc/gthr-posix.h:44:20: error: unistd.h: No such file or directory
In file included from ./gthr-default.h:1,
                 from ../../gcc-4.1.1/gcc/gthr.h:114,
                 from ../../gcc-4.1.1/gcc/unwind-dw2.c:42:
../../gcc-4.1.1/gcc/gthr-posix.h:46: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__gthread_key_t'
../../gcc-4.1.1/gcc/gthr-posix.h:47: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__gthread_once_t'
../../gcc-4.1.1/gcc/gthr-posix.h:48: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__gthread_mutex_t'
../../gcc-4.1.1/gcc/gthr-posix.h:49: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__gthread_recursive_mutex_t'
../../gcc-4.1.1/gcc/gthr-posix.h:88: error: 'pthread_once' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:88: warning: type defaults to 'int' in declaration of '__gthrw_pthread_once'
../../gcc-4.1.1/gcc/gthr-posix.h:89: error: 'pthread_getspecific' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:89: warning: type defaults to 'int' in declaration of '__gthrw_pthread_getspecific'
../../gcc-4.1.1/gcc/gthr-posix.h:90: error: 'pthread_setspecific' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:90: warning: type defaults to 'int' in declaration of '__gthrw_pthread_setspecific'
../../gcc-4.1.1/gcc/gthr-posix.h:91: error: 'pthread_create' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:91: warning: type defaults to 'int' in declaration of '__gthrw_pthread_create'
../../gcc-4.1.1/gcc/gthr-posix.h:92: error: 'pthread_cancel' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:92: warning: type defaults to 'int' in declaration of '__gthrw_pthread_cancel'
../../gcc-4.1.1/gcc/gthr-posix.h:93: error: 'pthread_mutex_lock' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:93: warning: type defaults to 'int' in declaration of '__gthrw_pthread_mutex_lock'
../../gcc-4.1.1/gcc/gthr-posix.h:94: error: 'pthread_mutex_trylock' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:94: warning: type defaults to 'int' in declaration of '__gthrw_pthread_mutex_trylock'
../../gcc-4.1.1/gcc/gthr-posix.h:95: error: 'pthread_mutex_unlock' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:95: warning: type defaults to 'int' in declaration of '__gthrw_pthread_mutex_unlock'
../../gcc-4.1.1/gcc/gthr-posix.h:96: error: 'pthread_mutex_init' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:96: warning: type defaults to 'int' in declaration of '__gthrw_pthread_mutex_init'
../../gcc-4.1.1/gcc/gthr-posix.h:99: error: 'pthread_key_create' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:99: warning: type defaults to 'int' in declaration of '__gthrw_pthread_key_create'
../../gcc-4.1.1/gcc/gthr-posix.h:100: error: 'pthread_key_delete' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:100: warning: type defaults to 'int' in declaration of '__gthrw_pthread_key_delete'
../../gcc-4.1.1/gcc/gthr-posix.h:101: error: 'pthread_mutexattr_init' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:101: warning: type defaults to 'int' in declaration of '__gthrw_pthread_mutexattr_init'
../../gcc-4.1.1/gcc/gthr-posix.h:102: error: 'pthread_mutexattr_settype' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:102: warning: type defaults to 'int' in declaration of '__gthrw_pthread_mutexattr_settype'
../../gcc-4.1.1/gcc/gthr-posix.h:103: error: 'pthread_mutexattr_destroy' undeclared here (not in a function)
../../gcc-4.1.1/gcc/gthr-posix.h:103: warning: type defaults to 'int' in declaration of '__gthrw_pthread_mutexattr_destroy'
../../gcc-4.1.1/gcc/gthr-posix.h:513: error: expected ')' before '*' token
../../gcc-4.1.1/gcc/gthr-posix.h:522: error: expected ')' before '*' token
../../gcc-4.1.1/gcc/gthr-posix.h:528: error: expected ')' before 'key'
../../gcc-4.1.1/gcc/gthr-posix.h:534: error: expected ')' before 'key'
../../gcc-4.1.1/gcc/gthr-posix.h:540: error: expected ')' before 'key'
../../gcc-4.1.1/gcc/gthr-posix.h:546: error: expected ')' before '*' token
../../gcc-4.1.1/gcc/gthr-posix.h:555: error: expected ')' before '*' token
../../gcc-4.1.1/gcc/gthr-posix.h:564: error: expected ')' before '*' token
../../gcc-4.1.1/gcc/gthr-posix.h:574: error: expected ')' before '*' token
../../gcc-4.1.1/gcc/gthr-posix.h:595: error: expected ')' before '*' token
../../gcc-4.1.1/gcc/gthr-posix.h:601: error: expected ')' before '*' token
../../gcc-4.1.1/gcc/gthr-posix.h:607: error: expected ')' before '*' token
In file included from ../../gcc-4.1.1/gcc/unwind-dw2.c:256:
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:32:20: error: signal.h: No such file or directory
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:33:26: error: sys/ucontext.h: No such file or directory
In file included from ../../gcc-4.1.1/gcc/unwind-dw2.c:256:
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h: In function 'sh_fallback_frame_state':
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:181: error: field 'info' has incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:182: error: field 'uc' has incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:192: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:201: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:206: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:209: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:212: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:215: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:218: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:226: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:234: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:239: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:242: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/config/sh/linux-unwind.h:247: error: dereferencing pointer to incomplete type
../../gcc-4.1.1/gcc/unwind-dw2.c: In function 'uw_init_context_1':
../../gcc-4.1.1/gcc/unwind-dw2.c:1259: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'once_regsizes'
../../gcc-4.1.1/gcc/unwind-dw2.c:1259: error: 'once_regsizes' undeclared (first use in this function)
../../gcc-4.1.1/gcc/unwind-dw2.c:1259: error: (Each undeclared identifier is reported only once
../../gcc-4.1.1/gcc/unwind-dw2.c:1259: error: for each function it appears in.)
../../gcc-4.1.1/gcc/unwind-dw2.c:1259: error: 'PTHREAD_ONCE_INIT' undeclared (first use in this function)
../../gcc-4.1.1/gcc/unwind-dw2.c:1260: warning: implicit declaration of function '__gthread_once'
make[2]: *** [libgcc/./unwind-dw2.o] Error 1
make[2]: Leaving directory `/home/james/develop/my/dc-linux-homebrew/bin/build-gcc/gcc'
make[1]: *** [stmp-multilib] Error 2
make[1]: Leaving directory `/home/james/develop/my/dc-linux-homebrew/bin/build-gcc/gcc'
make: *** [all-gcc] Error 2