pull in getopt; add -o argument to specify output file name

wscript

@@ -7,6 +7,7 @@ def options(opt):
 
 def configure(conf):
     conf.load("compiler_c compiler_cxx flex bison");
+    conf.check(header_name = "getopt.h", global_define = False)
 
 def build(bld):
     bld.load("compiler_c compiler_cxx flex bison");