Without the attached patch, I'd get this new link failure on OS X:

Undefined symbols for architecture x86_64:
  "_libintl_gettext", referenced from:
      _apply_mode in src_libstdbuf_so-libstdbuf.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
make[2]: *** [src/libstdbuf.so] Error 1