configure.ac: Add subdir-objects to satisfy newer automakes

diff --git a/configure.ac b/configure.ac
index afd81774c01e2b65db4345cdb3e0203743994629..7d738b30059350d27728bd860636806af0932faa 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -22,7 +22,7 @@ P11KIT_AGE=0
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([build/m4])
 AC_CONFIG_AUX_DIR([build/litter])
-AM_INIT_AUTOMAKE([1.12 foreign serial-tests])
+AM_INIT_AUTOMAKE([1.12 foreign serial-tests subdir-objects])
 AM_SANITY_CHECK
 AM_MAINTAINER_MODE([enable])
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])],)