AC_CACHE_CHECK([for struct option in <getopt.h>], [dx_cv_have_struct_option],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <getopt.h>],
AC_CACHE_CHECK([for struct option in <getopt.h>], [dx_cv_have_struct_option],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <getopt.h>],