arts: find libmad without pkgconfig

Thanks to "Nix" for the patch!


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/dependencies/arts@1242782 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

flow/gsl/CMakeLists.txt

@@ -63,7 +63,11 @@ if( WITH_MAD )
   if( MAD_FOUND )
     set( GSL_HAVE_LIBMAD 1 )
   else( MAD_FOUND )
-    message(FATAL_ERROR "\nMAD support are requested, but `libmad` not found" )
+    find_library( MAD_LIBRARIES NAMES mad )
+    find_path( MAD_INCLUDE_DIRS mad.h )
+    if( NOT MAD_LIBRARIES )
+        message(FATAL_ERROR "\nMAD support is requested, but `libmad` not found" )
+    endif( NOT MAD_LIBRARIES )
   endif( MAD_FOUND )
 
 endif( WITH_MAD )