Signed build has link to system lib not found on 10.9 (Mavericks)

[evoskuil]

dyld: Symbol not found: _fchmodat
Referenced from: /usr/local/bin/bs
Expected in: /usr/lib/libSystem.B.dylib
in /usr/local/bin/bs
Trace/BPT trap: 5 

Works in 10.10 (Yosemite).

$ otool -L bs
bs:
    /opt/local/lib/libcrypto.1.0.0.dylib (compatibility version 1.0.0, current version 1.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)
    /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 120.0.0)

[evoskuil]

The function _fcmodat is only referenced from boost filesystem here

[evoskuil]

Good explanation of the problem and affected environments here. This confirms that the current static binary will not work on OSX 10.9 but will work on OSX 10.10.