I tried to rebuild gegl on alpha and encountered the following problem:
gegl-node.c: In function 'set_property':
gegl-node.c:243: error: expected expression before 'va_list'
gegl-node.c:245: error: 'var_args' undeclared (first use in this function)
gegl-node.c:245: error: (Each undeclared identifier is reported only once
gegl-node.c:245: error: for each function it appears in.)

I patched it this way and now it works:
--- gegl/graph/gegl-node.c      2007-10-12 13:56:08.000000000 +0200
+++ gegl/graph/gegl-node.c.orig 2007-11-21 15:21:22.000000000 +0100
@@ -232,6 +232,7 @@
               const GValue *value,
               GParamSpec   *pspec)
 {
+  va_list var_args;
   GeglNode *node = GEGL_NODE (gobject);
   switch (property_id)
     {
@@ -241,7 +242,7 @@

       case PROP_OP_CLASS:
         gegl_node_set_op_class (node, g_value_get_string (value),
-                                NULL, NULL);
+                                NULL, var_args);
         break;

       case PROP_OPERATION:




However. I wonder why this doesn't occur on x86/ppc, ... Any idea?