build: fix failing 'make check' for docs with new automake

diff --git a/configure.ac b/configure.ac
index 7976644..83d4866 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -8,7 +8,7 @@ AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 
-AM_INIT_AUTOMAKE([1.11 nostdinc silent-rules subdir-objects tar-pax -Wno-portability])
+AM_INIT_AUTOMAKE([1.11 nostdinc silent-rules subdir-objects tar-pax -Wno-portability serial-tests])
 
 # Checks for programs.
 AC_PROG_CC