Change to AM_MAINTAINER_MODE([enable])

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=653429

configure.ac

@@ -60,6 +60,7 @@ AC_CONFIG_MACRO_DIR([m4macros])
 cflags_set=${CFLAGS+set}
 
 AM_INIT_AUTOMAKE([1.11 no-define no-dist-gzip dist-xz tar-ustar])
+AM_MAINTAINER_MODE([enable])
 
 # Support silent build rules. Disable
 # by either passing --disable-silent-rules to configure or passing V=1
@@ -103,9 +104,6 @@ AC_SUBST(LT_REVISION)
 AC_SUBST(LT_AGE)
 AC_SUBST(LT_CURRENT_MINUS_AGE)
 
-dnl Initialize maintainer mode
-AM_MAINTAINER_MODE
-
 dnl Checks for programs.
 AC_PROG_CC
 AC_PROG_CPP