I have a possible solution (but it adds a for-loop) that avoids
`lgbuild' of the output arg before `set_xincod'. I get only
1 fail because the csd file contains

  gamsigr = aw4 + gamsigr

where gamsigr is undefined. Here is the patch

diff -ur csound5~/Engine/csound_orc_compile.c csound5/Engine/csound_orc_compile.c
--- csound5~/Engine/csound_orc_compile.c	2012-05-07 17:09:51.000000000 +0200
+++ csound5/Engine/csound_orc_compile.c	2012-05-07 17:15:43.000000000 +0200
@@ -489,9 +489,9 @@
           }
           /* VL 14/12/11 : calling lgbuild here seems to be problematic for
              undef arg checks */
-          /* else { */
-          /*   lgbuild(csound, arg, 1); */
-          /* } */
+          else {
+            lgbuild(csound, arg, 1);
+          }
 
 
         }
@@ -510,15 +510,16 @@
         //        csound->Message(csound, "Opcode InTypes: %s\n", ep->intypes);
         //        csound->Message(csound, "Opcode OutTypes: %s\n", ep->outypes);
 
+        for (outargs = root->left; outargs != NULL; outargs = outargs->next) {
+          arg = outargs->value->lexeme;
+          tp->outlist->arg[argcount++] = strsav_string(csound, arg);
+        }
         set_xincod(csound, tp, ep, root->line);
         /* OUTARGS */
         for (outargs = root->left; outargs != NULL; outargs = outargs->next) {
 
           arg = outargs->value->lexeme;
 
-          tp->outlist->arg[argcount++] =
-            strsav_string(csound, arg);
-
           if ((n = pnum(arg)) >= 0) {
             if (n > ip->pmax)  ip->pmax = n;
           }

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