Oops. --disable-libIDL doesn't work as the macro is checking for --without-libIDL

configure

@@ -51,7 +51,7 @@ ac_help="$ac_help
 ac_help="$ac_help
   --with-static-qt        Link qt statically if possible"
 ac_help="$ac_help
-  --disable-libIDL        Disable checking of libIDL"
+  --without-libIDL        Skip check for libIDL"
 ac_help="$ac_help
   --with-libIDL-prefix=PFX
                           Prefix where libIDL is installed (optional)"

configure.in

@@ -1619,7 +1619,7 @@ SKIP_IDL_CHECK="no"
 
 dnl = Allow users to disable libIDL checking for standalone modules
 AC_ARG_WITH(libIDL,
-[  --disable-libIDL        Disable checking of libIDL],
+[  --without-libIDL        Skip check for libIDL],
 [  if test "$withval" = "no"; then
 	SKIP_IDL_CHECK="yes"
    fi ])