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diff --git a/README.tru64 b/README.tru64
index d203ded..b1305ba 100644
--- a/README.tru64
+++ b/README.tru64
@@ -50,6 +50,11 @@ Perl threading is going to work only in Tru64 4.0 and newer releases,
 older operating releases like 3.2 aren't probably going to work
 properly with threads.
 
+In Tru64 V5 (at least V5.1A, V5.1B) you cannot build threaded Perl with gcc
+because the system header <pthread.h> explicitly checks for supported
+C compilers, gcc (at least 3.2.2) not being one of them.  But the
+system C compiler should work just fine.
+
 =head2 Long Doubles on Tru64
 
 You cannot Configure Perl to use long doubles unless you have at least