--- lightdm-1.32.0/configure.ac
+++ lightdm-1.32.0/configure.ac
@@ -13,6 +13,8 @@
 AC_PROG_LN_S
 AC_PROG_MKDIR_P
 AM_MAINTAINER_MODE
+AM_GNU_GETTEXT([external])
+AM_GNU_GETTEXT_VERSION([0.22])
 
 dnl Check if the compiler really supports `-std=c99`.
 if test "x$ac_cv_prog_cc_c99" = xno; then