dnl Check if field re_magic exists in struct regex_t
AC_CACHE_CHECK([whether field re_magic exists in struct regex_t], ac_cv_regex_t_re_magic, [
AC_TRY_COMPILE([#include <sys/types.h>
-#include <regex.h>], [struct regex_t rt; rt.re_magic;],
+#include <regex.h>], [regex_t rt; rt.re_magic;],
[ac_cv_regex_t_re_magic=yes], [ac_cv_regex_t_re_magic=no])
])
if test "$ac_cv_regex_t_re_magic" = "yes"; then