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If on a Mac system you get the following error when compiling
w_display.c:

  In file included from commands.h:17,
                 from w_display.c:51:
  /usr/include/signal.h:71: error: 'NSIG' undeclared here (not in a
  function)
  make[5]: *** [w_display.o] Error 1

then try adding "-D_DARWIN_C_SOURCE" to the end of the STD_DEFINES
line in the Makefile.

This appears to be a Mac bug.

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