Use AS_FOR instead of for loop.

m4/acx_lang_check_include.m4

@@ -90,18 +90,17 @@ AC_DEFUN([ACX_GENERIC_CHECK_INCLUDE_PATHS_IFELSE],
      [AS_VAR_SET([save_flags],["@S|@$1"])
       while :; do
         m4_foreach([ACX_IncSet],[$9],
-          [for ac_incdir in ''m4_ifval([$4],[ $4]); do
-             AS_IF([test -z "$ac_incdir"],
-               [ac_res="none required"
-                $1="m4_ifval(ACX_IncSet,ACX_IncSet )$8 AS_VAR_GET([save_flags])"],
-               [ac_res="$2$ac_incdir"
-                $1="m4_ifval(ACX_IncSet,ACX_IncSet )$8 $ac_res AS_VAR_GET([save_flags])"])
-             _ACX_LANG_CHECK_INCLUDE_IFELSE([$3],dnl
-               [AS_IF([test -z "$ac_incdir"],dnl
-                  [AS_VAR_SET([acx_Include],["]m4_ifval(ACX_IncSet,ACX_IncSet )$8["])],dnl
-                  [AS_VAR_SET([acx_Include],["]m4_ifval(ACX_IncSet,ACX_IncSet )[$8 $2$ac_incdir"])])],,[$7])
-             AS_VAR_SET_IF([acx_Include], [break])
-           done
+          [AS_FOR([AC_INCDIR],[ac_incdir],['']m4_ifval([$4],[ $4]),
+             [AS_IF([test -z "$ac_incdir"],
+                [ac_res="none required"
+                 $1="m4_ifval(ACX_IncSet,ACX_IncSet )$8 AS_VAR_GET([save_flags])"],
+                [ac_res="$2$ac_incdir"
+                 $1="m4_ifval(ACX_IncSet,ACX_IncSet )$8 $ac_res AS_VAR_GET([save_flags])"])
+              _ACX_LANG_CHECK_INCLUDE_IFELSE([$3],dnl
+                [AS_IF([test -z "$ac_incdir"],dnl
+                   [AS_VAR_SET([acx_Include],["]m4_ifval(ACX_IncSet,ACX_IncSet )$8["])],dnl
+                   [AS_VAR_SET([acx_Include],["]m4_ifval(ACX_IncSet,ACX_IncSet )[$8 $2$ac_incdir"])])],,[$7])
+              AS_VAR_SET_IF([acx_Include], [break])])
            AS_VAR_SET_IF([acx_Include], [break])
           ])
         break

m4/acx_option_search_libs.m4

@@ -54,17 +54,16 @@ dnl is given or not.
 AC_DEFUN([_ACX_OPTION_SEARCH_LIBS],
   [acx_option_func_search_save_LIBS="$LIBS"
    AC_LANG_CONFTEST([m4_ifval([$6],[AC_LANG_PROGRAM([$5],[$6])],[AC_LANG_CALL([$5], [$1])])])
-   for ac_lib in '' $2; do
-     AS_IF([test -z "$ac_lib"],
-       [ac_res="none required"
-        LIBS="m4_ifval([$4],[$4 ])m4_ifnblank($3,[$3 ])$acx_option_func_search_save_LIBS"],
-       [ac_res="-l$ac_lib"
-        LIBS="m4_ifval([$4],[$4 ])$ac_res m4_ifnblank($3,[$3 ])$acx_option_func_search_save_LIBS"])
-     AC_LINK_IFELSE([], [AS_IF([test x"$ac_res" = x"none required"],dnl
+   AS_FOR([AC_LIB],[ac_lib],['' $2],
+     [AS_IF([test -z "]AC_LIB["],
+        [ac_res="none required"
+         LIBS="m4_ifval([$4],[$4 ])m4_ifnblank($3,[$3 ])$acx_option_func_search_save_LIBS"],
+        [ac_res="-l]AC_LIB["
+         LIBS="m4_ifval([$4],[$4 ])$ac_res m4_ifnblank($3,[$3 ])$acx_option_func_search_save_LIBS"])
+      AC_LINK_IFELSE([], [AS_IF([test x"$ac_res" = x"none required"],dnl
         [AS_VAR_SET([ac_Search],["]m4_ifval([$4],[$4 ])[$3"])],dnl
-        [AS_VAR_SET([ac_Search],["]m4_ifval([$4],[$4 ])[-l$ac_lib $3"])])])
-     AS_VAR_SET_IF([ac_Search], [break])
-   done
+        [AS_VAR_SET([ac_Search],["]m4_ifval([$4],[$4 ])[-l]AC_LIB[ $3"])])])
+      AS_VAR_SET_IF([ac_Search], [break])])
    rm conftest.$ac_ext
    LIBS="$acx_option_func_search_save_LIBS"])
 dnl ACX_OPTION_SEARCH_LIBS(FUNCTION, SEARCH-LIBS,