build: lower the gettext requirement 0.18 -> 0.17

RHEL6 only has gettext 0.17.

diff --git a/configure.ac b/configure.ac
index 5bb6bb80bccef02f3d72f7526c02939251fffaa9..9e36208b23cb29fa8e5be0c7733e732c0e0c7d83 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1159,7 +1159,7 @@ AC_SUBST(NOTMUCH_LIBS)
 
 dnl -- iconv/gettext --
 
-AM_GNU_GETTEXT_VERSION([0.18])
+AM_GNU_GETTEXT_VERSION([0.17])
 AM_GNU_GETTEXT([external])
 AC_CHECK_HEADERS([locale.h])