1.5.1 build fails on OS X when using libc++

[lucas-clemente]

Compiling the 1.5.1 prerelease using libc++ fails in the file DirectoryWatcher.cpp.

src/DirectoryWatcher.cpp:419:4: error: use of undeclared identifier 'close'
                        close(_dirFD);
                        ^
src/DirectoryWatcher.cpp:426:3: error: use of undeclared identifier 'close'
                close(_dirFD);
                ^
src/DirectoryWatcher.cpp:427:3: error: use of undeclared identifier 'close'
                close(_queueFD);
                ^

My configure command was

../src/configure --prefix=../install --no-tests --no-samples --cflags='-fPIC -stdlib=libc++' --static --omit=Data,Zip --config=Darwin64-clang

As a fix, #include <unistd.h> should be inserted in the file on OS X. I have not submitted a pull request since I'm not 100% sure where in the file to put it.

[aleks-f]

Thanks, fixed:

7094df5