build: avoid automake warning that suggests use of subdir-objects

* configure.ac (AM_INIT_AUTOMAKE): Use the subdir-objects option.

diff --git a/configure.ac b/configure.ac
index b2b5d0ace1512564a28a8864497c36020b584424..af6856fdac1274f2b89463babca6316d00cb1c2e 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -28,7 +28,7 @@ AC_CONFIG_SRCDIR([gzip.c])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([lib/config.h:lib/config.hin])
-AM_INIT_AUTOMAKE([1.11 dist-xz color-tests parallel-tests])
+AM_INIT_AUTOMAKE([1.11 subdir-objects dist-xz color-tests parallel-tests])
 AM_SILENT_RULES([yes]) # make --enable-silent-rules the default.
 
 dnl POSIXCHECK is worthwhile for maintainers, but adds several seconds