The build of base fails with:
shared_obj/ix86/mingw32/gnu-gnu-gnu/objc-load.o(.text+0x302):objc-load.m:
undefined reference to `_objc_load_callback'
shared_obj/ix86/mingw32/gnu-gnu-gnu/objc-load.o(.text+0x39f):objc-load.m:
undefined reference to `_objc_load_callback'
shared_obj/ix86/mingw32/gnu-gnu-gnu/objc-load.o(.text+0x3cd):objc-load.m:
undefined reference to `_objc_load_callback'
shared_obj/ix86/mingw32/gnu-gnu-gnu/GSFFCallInvocation.o(.text+0xbef):
GSFFCallInvocation.m: undefined reference to `__objc_msg_forward'
dllwrap: gcc exited with status 1
The only think that, just now, I have seen, is that I've not shared
versions of the ffcall libraries. (but, following the README, they are
build only static...)