Block.h and Block_private.h symlinks don't work.
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PR #36 added symlinks to the libBlocksRuntime specific header locations (Block.h and Block_private.h in the top level header directory of the install prefix).
I've just tried to upgrade the libdispatch version used in the travis CI script for gnustep-base to the Swift corelibs (read: not horribly outdated) one and wanted to take advantage of that. As it turns out, the symlinks don't work so well:
https://travis-ci.org/ngrewe/base/jobs/476074822
As you can see, they can't find Availability.h (which would be expected, since it's located in the objc subdirectory).
A possible fix would be to install compatibility headers (just #inlcudeing the libobjc2 headers) instead of dumb symlinks.
Probably the simplest fix is to change the "Availability" to <objc/Availability>. That might break the headers in the not-installed configuration, but shouldn't be a problem. Can you test it, and if it works push it to master and the 1.9 branch?
Ooops, didn't see the pull request. That's a cleaner fix!