X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=configure.ac;h=4cd6c89a0184a49c67232c4f9ab00c30ad97ead3;hb=f3875c4a269a88121e5c1e72d3dc1a1fe545d2e8;hp=28bef09c2cda97c470f23de1a3400f50e207312e;hpb=c3440ae0c965a6f90f659e8e40f8b249cb64042b;p=chaz%2Ftar

diff --git a/configure.ac b/configure.ac
index 28bef09..4cd6c89 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,7 @@ AC_CONFIG_HEADERS([config.h:config.hin])
 AC_PREREQ([2.57])
 AM_INIT_AUTOMAKE([1.7.5 gnits dist-bzip2 dist-shar])
 
-AC_GNU_SOURCE
+gl_USE_SYSTEM_EXTENSIONS
 AC_PROG_CC
 AC_AIX
 AC_MINIX
@@ -201,6 +201,19 @@ else
     [Define to the full path of your rsh, if any.])
 fi
 
+AC_MSG_CHECKING(for default archive format)
+
+if test -z "$DEFAULT_ARCHIVE_FORMAT"; then
+  DEFAULT_ARCHIVE_FORMAT="GNU"
+fi
+case $DEFAULT_ARCHIVE_FORMAT in
+  V7|OLDGNU|POSIX|GNU) ;;
+  *) AC_MSG_ERROR(Invalid format name);;
+esac
+AC_DEFINE_UNQUOTED(DEFAULT_ARCHIVE_FORMAT, ${DEFAULT_ARCHIVE_FORMAT}_FORMAT,
+  [By default produce archives of this format])
+AC_MSG_RESULT($DEFAULT_ARCHIVE_FORMAT)
+
 AC_MSG_CHECKING(for default archive)
 
 if test -z "$DEFAULT_ARCHIVE"; then