diff -urN uim-1.8.1.orig/sigscheme/libgcroots/Makefile.am uim-1.8.1/sigscheme/libgcroots/Makefile.am
--- uim-1.8.1.orig/sigscheme/libgcroots/Makefile.am	2012-07-02 12:16:36.432239740 +0800
+++ uim-1.8.1/sigscheme/libgcroots/Makefile.am	2012-07-02 12:18:27.177855230 +0800
@@ -19,6 +19,8 @@
 
 include libtool-version.mk
 
+ACLOCAL_AMFLAGS = -I m4
+
 # $(distdir) does work as a part of $(RELEASE_URL) when configured as a
 # subpackage.
 DIST_NAME = $(PACKAGE)-$(VERSION)
diff -urN uim-1.8.1.orig/sigscheme/Makefile.am uim-1.8.1/sigscheme/Makefile.am
--- uim-1.8.1.orig/sigscheme/Makefile.am	2012-07-02 12:16:36.408240040 +0800
+++ uim-1.8.1/sigscheme/Makefile.am	2012-07-02 12:17:58.557213036 +0800
@@ -4,6 +4,8 @@
 endif
 SUBDIRS += include src lib test test-c bench
 
+ACLOCAL_AMFLAGS = -I m4
+
 # To make 'make distclean' workable on --with-libgcroots=tiny-subdir,
 # libgcroots must be eliminated from $DIST_SUBDIRS.
 DIST_SUBDIRS = $(SUBDIRS)