diff -r 3a36c926a7aa -r 33b6df33a2b7 common/autoconf/build-performance.m4
--- a/common/autoconf/build-performance.m4	Tue May 28 17:57:40 2013 -0700
+++ b/common/autoconf/build-performance.m4	Wed May 29 13:58:40 2013 +0200
@@ -145,6 +145,9 @@
     if test "$JOBS" -gt "16"; then
       JOBS=16
     fi
+    if test "$JOBS" -eq "0"; then
+      JOBS=1
+    fi
     AC_MSG_RESULT([$JOBS])
   else
     JOBS=$with_jobs