--- src/runtime/config/gen-posix-names.sh.orig	Tue Oct 10 21:26:35 2000
+++ src/runtime/config/gen-posix-names.sh	Tue Mar 11 22:50:21 2003
@@ -36,17 +36,20 @@
   /lib/cpp > $INCLFILE <<XXX
 #include <unistd.h>
 XXX
-elif [ -r "/usr/include/sys/unistd.h" ]; then
-  INCLFILE=/usr/include/sys/unistd.h
-elif [ -r "/usr/include/confname.h" ]; then
-  INCLFILE=/usr/include/confname.h
-elif [ -r "/usr/include/unistd.h" ]; then
-  INCLFILE=/usr/include/unistd.h
-elif [ -r "/usr/include/bsd/unistd.h" ]; then
-  INCLFILE=/usr/include/bsd/unistd.h
 else
-  echo "gen-posix-names.sh: unable to find <unistd.h>"
-  exit 1
+  INCLFILE=""
+  for f in "/usr/include/sys/unistd.h" \
+	"/usr/include/confname.h"      \
+	"/usr/include/unistd.h"        \
+	"/usr/include/bsd/unistd.h"; do
+    if [ -r "$f" ]; then
+      INCLFILE="$INCLFILE $f"
+    fi
+  done
+  if [ -z "$INCLFILE" ];  then
+    echo "gen-posix-names.sh: unable to find <unistd.h>"
+    exit 1
+  fi
 fi
 
 echo "/* $OUTF" >> $OUTF