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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_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#define _XOPEN_SOURCE 4
#define _XOPEN_SOURCE_EXTENDED 1
#define _XOPEN_VERSION 4
#define _DEFAULT_SOURCE
#define _XPG4_2
#define _XPG6
#include <unistd.h>
]], [[
crypt("a", "b");
]])],[
i_cv_use_xpg6_crypt=yes
], [
i_cv_use_xpg6_crypt=no
])
])
AS_IF([test $i_cv_use_xpg6_crypt = yes], [
AC_DEFINE(CRYPT_USE_XPG6,, [Define if _XPG6 macro is needed for crypt()])
])
])
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