check for cppunit

configure.in

@@ -110,6 +110,7 @@ if test "$have_stacktrace" = "yes"; then
                    [-lintl -liberty])
   fi
 fi
+AM_PATH_CPPUNIT([1.0.0], [have_cppunit="yes"], [have_cppunit="no"])
 
 # export macros
 AC_SUBST(HAVE_DOT)
@@ -132,6 +133,10 @@ if test "$have_dot" = "no"; then
 AC_MSG_WARN([Missing program dot!
   - when you rebild documentation with make doc, there are no generated images
   - there are precompiled derieved files in the distribution]); fi
+if test "$have_cppunit" = "no"; then
+AC_MSG_WARN([Missing cppunit development library!
+  - you cannot check the library using "make check"
+  - everything else works perfectly]); fi
 if test "$have_pedantic" == "yes"; then
 AC_MSG_NOTICE([Pedantic compile mode enabled!
   - all warnings for GNU g++ are enabled