language check in configure.in was causing command line overflow issue

configure.in

@@ -8877,9 +8877,14 @@ for lang in $WITH_LANG ; do
     test "$lang" = "ALL" && continue;
     test "$lang" = "kid" && continue;
     # need to check for the exact string, so add space before and after the list of all languages
-    all_langs=" $ALL_LANGS "
-    test `echo "$all_langs" | sed "s|.* $lang .*|found|"` = "found" && continue;
-    AC_MSG_ERROR([invalid language: $lang; supported languages are: $ALL_LANGS])
+    for vl in $ALL_LANGS ; do
+        if test "$vl" = "$lang" ; then
+           break;
+        fi
+    done
+    if test "$vl" != "$lang" ; then
+        AC_MSG_ERROR([invalid language: $lang; supported languages are: $ALL_LANGS])
+    fi
 done
 # list with substituted ALL
 WITH_LANG_LIST=`echo $WITH_LANG | sed "s/ALL/$ALL_LANGS/"`