--- a/common/autoconf/basics.m4	Thu May 04 16:38:07 2017 +0000
+++ b/common/autoconf/basics.m4	Fri May 05 04:45:50 2017 +0000
@@ -1099,6 +1099,7 @@
   BASIC_PATH_PROGS(HG, hg)
   BASIC_PATH_PROGS(STAT, stat)
   BASIC_PATH_PROGS(TIME, time)
+  BASIC_PATH_PROGS(FLOCK, flock)
   # Dtrace is usually found in /usr/sbin on Solaris, but that directory may not
   # be in the user path.
   BASIC_PATH_PROGS(DTRACE, dtrace, $PATH:/usr/sbin)