By analogy how about the following, which I can't test?
Hans
Index: aix_irix_threads.c
===================================================================
RCS file: /cvs/gcc/gcc/boehm-gc/aix_irix_threads.c,v
retrieving revision 1.2
diff -u -r1.2 aix_irix_threads.c
--- aix_irix_threads.c 13 Aug 2004 23:05:29 -0000 1.2
+++ aix_irix_threads.c 23 Aug 2004 20:30:37 -0000
@@ -26,9 +26,10 @@
* as a base instead.
*/
+# include "private/gc_priv.h"
+
# if defined(GC_IRIX_THREADS) || defined(GC_AIX_THREADS)
-# include "private/gc_priv.h"
# include <pthread.h>
# include <assert.h>
# include <semaphore.h>