`sh  cflags hash.o` -DPERL_FOR_X2P hash.c
          CCCMD =  cc -c -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O
"/usr/include/stdlib.h", line 165: identifier redeclared: getsubopt
        current : function(pointer to pointer to char, pointer to pointer to char, pointer to pointer to char) returning int
        previous: function(pointer to pointer to char, pointer to const pointer to char, pointer to pointer to char) returning int : "/usr/include/stdio.h", line 267
"/usr/include/stdlib.h", line 189: identifier redeclared: getopt
        current : function(int, pointer to pointer to char, pointer to char) returning int
        previous: function(int, pointer to const pointer to char, pointer to const char) returning int : "/usr/include/stdio.h", line 265
cc: acomp failed for hash.c
*** Error code 2
make: Fatal error: Command failed for target `hash.o'