Index: parrot/src/library.c
===================================================================
--- parrot/src/library.c	(revision 37327)
+++ parrot/src/library.c	(working copy)
@@ -710,7 +710,65 @@
 }
 
 /*
+=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);
+
+    prefix = Parrot_get_runtime_path(interp);
+    n = VTABLE_elements(interp, paths);
+
+    for (i = 0; i < n; ++i) {
+        STRING * const path = VTABLE_get_string_keyed_int(interp, paths, i);
+        STRING *found_name;
+
+        if ( 0 == i ) {
+            full_path = Parrot_str_copy(interp, path);
+        } else {
+            if(path) {
+                full_path = Parrot_str_append(interp, full_path, envpathsep);
+                full_path = Parrot_str_append(interp, full_path, path);
+            }
+        }
+    }
+
+    return full_path;
+}
+
+/*
+
 =item C<char* Parrot_get_runtime_prefix>
 
 Return a malloced C-string for the runtime prefix.  The calling function
Index: parrot/src/dynext.c
===================================================================
--- parrot/src/dynext.c	(revision 37327)
+++ parrot/src/dynext.c	(working copy)
@@ -615,8 +615,18 @@
         /*
          * 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 '%s'; searched path %s\n", 
+                wo_ext->strstart, path->strstart);
     }
 
     return run_init_lib(interp, handle, lib_name, wo_ext);
Index: parrot/include/parrot/library.h
===================================================================
--- parrot/include/parrot/library.h	(revision 37327)
+++ parrot/include/parrot/library.h	(working copy)
@@ -74,6 +74,13 @@
         __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);