diff --git a/gdb/config/pa/hppahpux.mh b/gdb/config/pa/hppahpux.mh
index 3e22734674f..4841de46a19 100644
--- a/gdb/config/pa/hppahpux.mh
+++ b/gdb/config/pa/hppahpux.mh
@@ -6,3 +6,4 @@ NAT_FILE= nm-hppah.h
 NATDEPFILES= hppah-nat.o coredep.o corelow.o inftarg.o fork-child.o paread.o
 REGEX=regex.o
 REGEX1=regex.o
+HOST_IPC=-DBSD_IPC -DPOSIX_WAIT