diff --git a/configure b/configure
index 67f88eb0fd..bc3a2180e9 100755
--- a/configure
+++ b/configure
@@ -2873,6 +2873,10 @@ case $target_os in
                       -l:drtaeabi.dso -l:scppnwdl.dso -lsupc++ -lgcc \
                       -l:libc.dso -l:libm.dso -l:euser.dso -l:libcrt0.lib
         ;;
+    osf1)
+        add_cppflags -D_OSF_SOURCE -D_POSIX_PII -D_REENTRANT
+        AVSERVERLDFLAGS=
+        ;;
     none)
         ;;
     *)