dnl * Check for crypt() if unistd.h compiles with _XOPEN_SOURCE + _XPG6

dnl * Add other macros there too "just in case".

AC_DEFUN([DOVECOT_CRYPT_XPG6], [

AC_CACHE_CHECK([if we should use _XPG6 macro for crypt()],i_cv_use_xpg6_crypt,[

AC_TRY_COMPILE([

#define _XOPEN_SOURCE 4

#define _XOPEN_SOURCE_EXTENDED 1

#define _XOPEN_VERSION 4

#define _XPG4_2

#define _XPG6

#include <unistd.h>

], [

crypt("a", "b");

], [

i_cv_use_xpg6_crypt=yes

], [

i_cv_use_xpg6_crypt=no

])

])

if test $i_cv_use_xpg6_crypt = yes; then

AC_DEFINE(CRYPT_USE_XPG6,, [Define if _XPG6 macro is needed for crypt()])

fi

])