diff --git a/SWIG/configure.in b/SWIG/configure.in
index 15ba9c924..00ea697c4 100644
--- a/SWIG/configure.in
+++ b/SWIG/configure.in
@@ -1,4 +1,6 @@
 dnl Process this file with autoconf to produce a configure script.
+dnl The macros which aren't shipped with the autotools are stored in the 
+dnl Tools/config directory as .m4 files.
 
 AC_INIT([swig],[1.3.20],[http://www.swig.org])
 AC_PREREQ(2.54)
@@ -16,7 +18,6 @@ AH_BOTTOM([
 /* Values returned by SWIG when invoked with the -ldflags option */
 #define SWIG_GUILE_RUNTIME      "-L" LIBDIR " -lswigguile" RELEASE_SUFFIX
 #define SWIG_MZSCHEME_RUNTIME   "-L" LIBDIR " -lswigmz" RELEASE_SUFFIX
-#define SWIG_OCAML_RUNTIME      "-L" LIBDIR " -lswigocaml" RELEASE_SUFFIX
 #define SWIG_PERL_RUNTIME       "-L" LIBDIR " -lswigpl" RELEASE_SUFFIX
 #define SWIG_PIKE_RUNTIME       "-L" LIBDIR " -lswigpike" RELEASE_SUFFIX
 #define SWIG_PHP_RUNTIME        "-L" LIBDIR " -lswigphp4" RELEASE_SUFFIX
@@ -37,6 +38,7 @@ AC_CHECK_PROGS(AR, ar aal, ar)
 AC_SUBST(AR)
 AC_LIBTOOL_WIN32_DLL
 AC_PROG_LIBTOOL
+AC_COMPILE_WARNINGS # Increase warning levels
 
 AC_DEFINE_UNQUOTED(SWIG_CXX, ["$CXX"], [Compiler that built SWIG])
 AC_DEFINE_UNQUOTED(SWIG_PLATFORM, ["$build"], [Platform that SWIG is built for])