Modernize Makevars.
diff --git a/po/ChangeLog b/po/ChangeLog
index 3d253ea..1d9c6fe 100644
--- a/po/ChangeLog
+++ b/po/ChangeLog
@@ -1,3 +1,7 @@
+2010-06-04 Bruno Haible <bruno@clisp.org>
+
+ * Makevars (MSGMERGE_OPTIONS): Define to empty.
+
2010-06-04 gettextize <bug-gnu-gettext@gnu.org>
* Makefile.in.in: Upgrade to gettext-0.18.1.
diff --git a/po/Makevars b/po/Makevars
index 2f01c36..b3e79cb 100644
--- a/po/Makevars
+++ b/po/Makevars
@@ -48,3 +48,9 @@
# package uses functions taking also a message context, like pgettext(), or
# if in $(XGETTEXT_OPTIONS) you define keywords with a context argument.
USE_MSGCTXT = no
+
+# These options get passed to msgmerge.
+# Useful options are in particular:
+# --previous to keep previous msgids of translated messages,
+# --quiet to reduce the verbosity.
+MSGMERGE_OPTIONS =
