diff --git a/configuration/configure.ac b/configuration/configure.ac
index 0eb3933..ee1cf54 100644
--- a/configuration/configure.ac
+++ b/configuration/configure.ac
@@ -100,6 +100,7 @@
 AC_PATH_PROG(UNZIP, unzip)
 AC_PATH_PROG(GIT, git)
 AC_PATH_PROG(LOCKFILE, lockfile)
+AC_PATH_PROG(TR, tr)
 
 dnl Java stuff.
 AC_PROG_JAVA