ohrrpgce fbc 0.22 compile fail on Mac OS X 10.11 with gcc

palsink:~/src/ohr/wip james$ CC=clang GCC=/opt/local/bin/gcc scons
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
version_info(["ver.txt", "iver.txt", "distver.bat"], ["codename.txt"])
clang -o build/os_unix.o -c -g -Wall --std=gnu99 -O3 -DFBCVERSION=220 -mmacosx-version-min=10.4 -m32 os_unix.c
In file included from os_unix.c:36:
./common.h:70:6: error: expected expression
void _noreturn (*fb_ErrorThrowAt(int line_num, const char *mod_name, void *res_label, void *resnext_label))(void);
     ^
./common.h:41:22: note: expanded from macro '_noreturn'
#  define _noreturn [[noreturn]]
                     ^
1 error generated.
scons: *** [build/os_unix.o] Error 1
scons: building terminated because of errors.