diff --git a/configuration/configure.ac b/configuration/configure.ac
index bfc8141..09c9d5e 100644
--- a/configuration/configure.ac
+++ b/configuration/configure.ac
@@ -98,6 +98,7 @@
 AC_PATH_PROG(ZIP, zip)
 AC_PATH_PROG(UNZIP, unzip)
 AC_PATH_PROG(GIT, git)
+AC_PATH_PROG(LOCKFILE, lockfile)
 
 dnl Java stuff.
 AC_PROG_JAVA