- On systems where -fblocks is supported, specify an additional library
- path in which libBlocksRuntime can be found. This is not required on
- Mac OS X, where the Blocks runtime is included in libSystem, but is
- required on FreeBSD.
+ On systems where -fblocks is supported, specify an additional library path
+ in which libBlocksRuntime can be found. This is not required on Mac OS X,
+ where the Blocks runtime is included in libSystem, but is required on
+ FreeBSD.
+
+The following options are likely to only be useful when building libdispatch on
+Mac OS X as a replacement for /usr/lib/system/libdispatch.dylib:
+
+--with-apple-objc4-source