configure: Allow --enable-silent-rules when Automake supports it.

I personally find this makes the build easier to follow.

diff --git a/configure.ac b/configure.ac
index f6fdd4f9098b6bcfd0f8d68315ca8f011c091e11..032b6f505c3dee9410327b94bbb1cc14673e945c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -336,6 +336,8 @@ PSPP_CHECK_PREREQS
 AC_CONFIG_FILES(
   [Makefile gl/Makefile po/Makefile tests/atlocal perl-module/lib/PSPP.pm])
 
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])
+
 AC_OUTPUT
 echo "PSPP configured successfully."