Damn it! libtool is a pain in the ass!

make dune work with both... new and old libtool versions

[[Imported from SVN: r5129]]

m4/dune.m4

@@ -33,7 +33,7 @@ AC_DEFUN([DUNE_CHECK_MODULES],[
   AC_REQUIRE([AC_PROG_CXX])
   AC_REQUIRE([AC_PROG_CXXCPP])
   AC_REQUIRE([AC_PROG_LIBTOOL])
-  AC_REQUIRE([LT_OUTPUT])
+  m4_ifdef([LT_OUTPUT],[LT_OUTPUT])
   AC_REQUIRE([PKG_PROG_PKG_CONFIG])
   AC_REQUIRE([DUNE_DISABLE_LIBCHECK])
 
@@ -153,7 +153,7 @@ AC_DEFUN([DUNE_CHECK_MODULES],[
       HAVE_[]_DUNE_MODULE=0
 
       # define LTCXXCOMPILE like it will be defined in the Makefile
-      LTCXXLINK="./libtool --tag=CXX --mode=link $CXX $CXXFLAGS $LDFLAGS"
+      LTCXXLINK="$srcdir/libtool --tag=CXX --mode=link $CXX $CXXFLAGS $LDFLAGS"
       CXX="$LTCXXLINK"
 
       # use module LDFLAGS

m4/dune_all.m4

@@ -31,16 +31,16 @@ m4_define([DUNE_AC_INIT],[
   DUNE_PARSE_MODULE_FILE
   AC_INIT(DUNE_MOD_NAME, DUNE_MOD_VERSION, DUNE_MAINTAINER_NAME)
   # don't build shared libs per default, this is way better for debugging...
-  LT_INIT([disable-shared])
+  m4_ifdef([LT_INIT],
+    [LT_INIT],
+    [AC_DEFUN([LT_OUTPUT])])
   AC_DISABLE_SHARED
 ])
 
 AC_DEFUN([DUNE_CHECK_DEPENDENCIES], [
   AC_REQUIRE([PKG_PROG_PKG_CONFIG])
-  LT_LANG([C])
-  LT_LANG([C++])
-  AC_PROG_CXX
   AC_PROG_LIBTOOL
+  AC_PROG_CXX
   LT_OUTPUT
   DUNE_PARSE_MODULE_FILE
   DUNE_MODULE_DEPENDENCIES(DUNE_MOD_NAME)
@@ -107,7 +107,6 @@ dnl check for library functions
 
   # doxygen and latex take a lot of time...
   AC_REQUIRE([DUNE_DOCUMENTATION])
-
   # special variable to include the documentation into the website
   AC_ARG_WITH(duneweb,
     AC_HELP_STRING([--with-duneweb=PATH],[Only needed for website-generation, path to checked out version of dune-web]))