diff -up asciidoc-8.4.5/asciidoc.py.datadir asciidoc-8.4.5/asciidoc.py
--- asciidoc-8.4.5/asciidoc.py.datadir	2009-07-18 14:48:29.000000000 -0400
+++ asciidoc-8.4.5/asciidoc.py	2009-07-18 14:50:26.000000000 -0400
@@ -651,6 +651,8 @@ def filter_lines(filter_cmd, lines, attr
         if not found:
             found = findfilter(filtername, CONF_DIR, cmd)
         if not found:
+            found = findfilter(filtername, DATA_DIR, cmd)
+        if not found:
             found = findfilter(filtername, APP_DIR, cmd)
     else:
         if os.path.isfile(cmd):
@@ -4997,6 +4999,7 @@ APP_DIR = None              # This file'
 USER_DIR = None             # ~/.asciidoc
 # Global configuration files directory (set by Makefile build target).
 CONF_DIR = '/etc/asciidoc'
+DATA_DIR = '/usr/share/asciidoc'
 HELP_FILE = 'help.conf'     # Default (English) help file.
 
 # Globals
diff -up asciidoc-8.4.5/Makefile.in.datadir asciidoc-8.4.5/Makefile.in
--- asciidoc-8.4.5/Makefile.in.datadir	2009-04-23 18:49:43.000000000 -0400
+++ asciidoc-8.4.5/Makefile.in	2009-07-18 14:46:22.000000000 -0400
@@ -23,6 +23,7 @@ srcdir = @srcdir@
 VPATH = @srcdir@
 
 ASCIIDOCCONF = $(sysconfdir)/asciidoc
+ASCIIDOCDATA = $(datadir)/asciidoc
 
 prog = asciidoc.py a2x
 progdir = $(bindir)
@@ -126,6 +127,13 @@ fixconfpath:
 		mv $$f.out $$f; \
 	done
 
+fixdatapath:
+	@for f in $(prog); do \
+		echo "Fixing DATA_DIR in $$f"; \
+		$(SED) "s#^DATA_DIR = '.*'#DATA_DIR = '$(ASCIIDOCDATA)'#; s#^DATA_DIR=.*#DATA_DIR=$(ASCIIDOCDATA)#" $$f > $$f.out; \
+		mv $$f.out $$f; \
+	done
+
 install-vim:
 	@for d in $(DESTDIR)/$(vimdir) /etc/vim; do \
 		if ! test -d $$d; then continue; fi ; \
@@ -145,7 +153,7 @@ uninstall-vim:
 	done
 
 
-build: fixconfpath
+build: fixconfpath fixdatapath
 
 install: all $(PROGTARGETS) $(DATATARGETS) progsymlink install-vim