Index: src/library.c
===================================================================
--- src/library.c	(revision 38159)
+++ src/library.c	(working copy)
@@ -768,6 +768,50 @@
 
 /*
 
+=item C<STRING* Parrot_path_str>
+
+Returns a STRING that contains the specified path, separated by colons (:).  
+
+The C<enum_runtime_ft type> is one or more of the types defined in
+F<include/parrot/library.h>.
+
+=cut
+
+*/
+
+PARROT_EXPORT
+PARROT_WARN_UNUSED_RESULT
+PARROT_CAN_RETURN_NULL
+STRING*
+Parrot_path_str(PARROT_INTERP, enum_runtime_ft type)
+{
+    ASSERT_ARGS(Parrot_path_str)
+    STRING *prefix;
+    STRING *full_path;
+    PMC    *paths;
+    INTVAL  i, n;
+
+/* TODO: Get the real separator, not this hacked-together stuff */
+#ifdef WIN32
+    STRING * const envpathsep = CONST_STRING(interp, ";"); 
+#else
+    STRING * const envpathsep = CONST_STRING(interp, ":");
+#endif
+
+    if (type & PARROT_RUNTIME_FT_DYNEXT)
+        paths = get_search_paths(interp, PARROT_LIB_PATH_DYNEXT);
+    else if (type & (PARROT_RUNTIME_FT_PBC | PARROT_RUNTIME_FT_SOURCE))
+        paths = get_search_paths(interp, PARROT_LIB_PATH_LIBRARY);
+    else
+        paths = get_search_paths(interp, PARROT_LIB_PATH_INCLUDE);
+
+    full_path = Parrot_str_join(interp, envpathsep, paths);
+
+    return full_path;
+}
+
+/*
+
 =item C<char* Parrot_get_runtime_prefix(PARROT_INTERP)>
 
 Return a malloced C-string for the runtime prefix.  The calling function
Index: src/dynext.c
===================================================================
--- src/dynext.c	(revision 38159)
+++ src/dynext.c	(working copy)
@@ -620,8 +620,18 @@
         /*
          * XXX Parrot_ex_throw_from_c_args? return PMCNULL?
          * PMC Undef seems convenient, because it can be queried with get_bool()
+         * --
+         * Changed to Parrot_ex_throw_from_c_args because silently continuing and
+         * giving weird errors later is not a cool look - wayland/Tim Nelson
          */
-        return pmc_new(interp, enum_class_Undef);
+        /* return pmc_new(interp, enum_class_Undef); */
+
+        path = Parrot_path_str(interp, PARROT_RUNTIME_FT_DYNEXT);
+
+        Parrot_ex_throw_from_c_args(interp, NULL,
+                EXCEPTION_LIBRARY_ERROR,
+                "Parrot VM: Can't load library '%Ss'; searched path %Ss\n", 
+                wo_ext, path);
     }
 
     return run_init_lib(interp, handle, lib_name, wo_ext);
Index: include/parrot/library.h
===================================================================
--- include/parrot/library.h	(revision 38159)
+++ include/parrot/library.h	(working copy)
@@ -83,6 +83,13 @@
         __attribute__nonnull__(2)
         FUNC_MODIFIES(*file);
 
+PARROT_EXPORT
+PARROT_WARN_UNUSED_RESULT
+PARROT_CAN_RETURN_NULL
+STRING* Parrot_path_str(PARROT_INTERP,
+    enum_runtime_ft type)
+        __attribute__nonnull__(1);
+
 void parrot_init_library_paths(PARROT_INTERP)
         __attribute__nonnull__(1);