FD_SET linker errors

[Prof. S. Govindjee]

On some recent MACs the behavior of the linker with the synchronous I/O multiplexing system libraries has been causing link errors stating unresolved symbols:

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Undefined symbols for architecture x86_64:
  "___darwin_check_fd_set_overflow", referenced from:
      _cinput_x in Feappv_g.a(x11u.o)
ld: symbol(s) not found for architecture x86_64
To fix this issue, you can add the following linker directive to LDOPTIONS in makefile.in, or directly into the build line in main/makefile just before $(LDOPTIONS).

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-Wl,-U,___darwin_check_fd_set_overflow