OS_CODE           593 other-licenses/zlib/deflate.c                 put_byte(s, OS_CODE);
OS_CODE           190 other-licenses/zlib/gzio.c              Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
OS_CODE           168 other-licenses/zlib/zutil.h #ifndef OS_CODE