m4: crypt_xpg6.m4 - Modernize m4 syntax

diff --git a/m4/crypt_xpg6.m4 b/m4/crypt_xpg6.m4
index 9a86f46e5554427bf93fdaacea8678394693104e..0085b2ac769920bae0def76bd04539de19961d81 100644 (file)
--- a/m4/crypt_xpg6.m4
+++ b/m4/crypt_xpg6.m4
@@ -2,22 +2,22 @@ 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([
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
       #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
+  AS_IF([test $i_cv_use_xpg6_crypt = yes], [
     AC_DEFINE(CRYPT_USE_XPG6,, [Define if _XPG6 macro is needed for crypt()])
-  fi
+  ])
 ])