Add note about -D_REENTRANT for HP-UX 10.20.

diff --git a/README b/README
index 892a09cd695ea6ebb4eb13857164ef0e453e315b..8b31ca19ea7bb463dd53a07af24a80c83d4bec43 100644 (file)
--- a/README
+++ b/README
@@ -211,7 +211,11 @@ AIX:       A complete overhaul of the shared library support is now in
        (The optimizer bug reported at this place in previous releases
        has been worked around by a minimal code change.)
 
-HP-UX: Please read the file Misc/HPUX-NOTES.
+HP-UX: Please read the file Misc/HPUX-NOTES for shared libraries.
+       When using threading, you may have to add -D_REENTRANT to the
+       OPT variable in the top-level Makefile; reported by Pat Knight
+       this seems to make a difference (at least for HP-UX 10.20)
+       even though config.h defines it.
 
 Minix:  When using ack, use "CC=cc AR=aal RANLIB=: ./configure"!