With Autoconf 2.69 (instead of 2.68), config.{guess,sub} are needed.

--- automake-1.11.2/tests/compile_f90_c_cxx.test	2011-12-20 21:56:29.000000000 +0100
+++ automake-1.11.2/tests/compile_f90_c_cxx.test	2012-07-07 13:35:58.000000000 +0200
@@ -41,7 +41,7 @@ END
 : > baz.cc
 
 $ACLOCAL
-$AUTOMAKE
+$AUTOMAKE --add-missing
 
 # Look for the macros at the beginning of rules.  Be careful, as there
 # are literal tabs at the beginning of the search strings.