Unable to build/install mono

[skip at pobox.com]

I'm sitting there at PyCon listening to Mark Hammond's PyXPCOM talk.  It
crossed paths with IronPython and mono, so I decided to try installing it
and getting IronPython running.

But there was no joy.  I got errors during compilation:

     /usr/bin/gcc-4.0 -DPACKAGE_NAME=\"libgc-mono\" -DPACKAGE_TARNAME=\"libgc-mono\" -DPACKAGE_VERSION=\"6.6\" "-DPACKAGE_STRING=\"libgc-mono 6.6\"" -DPACKAGE_BUGREPORT=\"Hans_Boehm at hp.com\" -DGC_DARWIN_THREADS=1 -DTHREAD_LOCAL_ALLOC=1 -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DSILENT=1 -DNO_SIGNALS=1 -DNO_EXECUTE_PERMISSION=1 -DJAVA_FINALIZATION=1 -DGC_GCJ_SUPPORT=1 -DATOMIC_UNCOLLECTABLE=1 -D_IN_LIBGC=1 -I./.. -I./.. -I./include -I/opt/local/include -O2 -D_NONSTD_SOURCE -MT darwin_stop_world.lo -MD -MP -MF .deps/darwin_stop_world.Tpo -c darwin_stop_world.c  -fno-common -DPIC -o .libs/darwin_stop_world.o
    darwin_stop_world.c: In function 'GC_push_all_stacks':
    darwin_stop_world.c:106: error: 'i386_thread_state_t' has no member named '__esp'
    darwin_stop_world.c:108: error: 'i386_thread_state_t' has no member named '__eax'
    darwin_stop_world.c:109: error: 'i386_thread_state_t' has no member named '__ebx'
    darwin_stop_world.c:110: error: 'i386_thread_state_t' has no member named '__ecx'
    darwin_stop_world.c:111: error: 'i386_thread_state_t' has no member named '__edx'
    darwin_stop_world.c:112: error: 'i386_thread_state_t' has no member named '__edi'
    darwin_stop_world.c:113: error: 'i386_thread_state_t' has no member named '__esi'
    darwin_stop_world.c:114: error: 'i386_thread_state_t' has no member named '__ebp'
    make[3]: *** [darwin_stop_world.lo] Error 1
    make[2]: *** [all-recursive] Error 1
    make[1]: *** [all-recursive] Error 1
    make: *** [all] Error 2

    Error: Status 1 encountered during processing.

Any idea how to move past this point?

-- 
Skip Montanaro - skip at pobox.com - http://www.webfast.com/~skip/