dnl Do we need getopt_long
+dnl even when including our own getopt implementation
+dnl we may want to make sure we use the external
+dnl defined by libc to not run into linker resolve trouble
+
+AC_CACHE_CHECK([for opterr], rd_cv_var_int_opterr,
+[AC_TRY_LINK([#include <unistd.h>],
+ [extern int opterr; opterr = 1;],
+ [rd_cv_var_int_opterr=yes],
+ [rd_cv_var_int_opterr=no])])
+if test x"$rd_cv_var_int_opterr" = x"yes"; then
+ AC_DEFINE(HAVE_INT_OPTERR, 1, [Define to 1 if you have the global variable 'int opterr'.])
+fi
+
build_getopt=no
RRD_GETOPT_LONG="LIBC_HAS_GETOPT_LONG"
AC_CHECK_FUNC(getopt_long,[],[