build: require automake-1.11 and produce xz-compressed tarballs, too

* configure.ac: Require automake-1.11.  Use the dist-xz option.

diff --git a/configure.ac b/configure.ac
index 714cc876c060e85abefe21b597b2e349100dad50..07a9e1e0c6dd7ef4e291b35dc0a1579edc747e53 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -28,7 +28,7 @@ AC_INIT([gzip],
 AC_CONFIG_SRCDIR(gzip.c)
 AC_CONFIG_AUX_DIR(build-aux)
 AC_CONFIG_HEADERS([lib/config.h:lib/config.hin])
-AM_INIT_AUTOMAKE
+AM_INIT_AUTOMAKE([1.11 dist-xz])
 AM_SILENT_RULES([yes]) # make --enable-silent-rules the default.
 
 AC_PROG_CC_STDC