diff --git a/common.mk b/common.mk
index c893e55f29..899ab0b116 100644
--- a/common.mk
+++ b/common.mk
@@ -647,13 +647,11 @@ insns: $(INSNS)
 
 node_name.inc: {$(VPATH)}node.h
 
-encdb.h: $(PREP)
-	$(MINIRUBY) $(srcdir)/enc/make_encdb.rb $@.new $(srcdir)/enc enc
-	$(IFCHANGE) "$@" "$@.new"
+encdb.h: $(PREP) $(srcdir)/tool/generic_erb.rb $(srcdir)/template/encdb.h.tmpl
+	$(MINIRUBY) $(srcdir)/tool/generic_erb.rb -c -o $@ $(srcdir)/template/encdb.h.tmpl $(srcdir)/enc enc
 
-transdb.h: $(PREP) srcs-enc
-	$(MINIRUBY) $(srcdir)/enc/trans/make_transdb.rb $@.new $(srcdir)/enc/trans enc/trans
-	$(IFCHANGE) "$@" "$@.new"
+transdb.h: $(PREP) srcs-enc $(srcdir)/tool/generic_erb.rb $(srcdir)/template/transdb.h.tmpl
+	$(MINIRUBY) $(srcdir)/tool/generic_erb.rb -c -o $@ $(srcdir)/template/transdb.h.tmpl $(srcdir)/enc/trans enc/trans
 
 # {$(VPATH)}id.h: {$(VPATH)}parse.h $(srcdir)/tool/generic_erb.rb $(srcdir)/template/id.h.tmpl
 # 	$(BASERUBY) $(srcdir)/tool/generic_erb.rb --if-change --output=$@ \
diff --git a/enc/make_encdb.rb b/template/encdb.h.tmpl
similarity index 87%
rename from enc/make_encdb.rb
rename to template/encdb.h.tmpl
index 5a420aed32..e65b651050 100644
--- a/enc/make_encdb.rb
+++ b/template/encdb.h.tmpl
@@ -1,3 +1,4 @@
+<%
 #
 # OnigEncodingDefine(foo, Foo) = {
 #   ..
@@ -23,7 +24,6 @@ lines = []
 encodings = []
 defs = {}
 encdirs = ARGV.dup
-outhdr = encdirs.shift || 'encdb.h'
 encdirs << 'enc' if encdirs.empty?
 files = {}
 encdirs.each do |encdir|
@@ -63,15 +63,17 @@ encdirs.each do |encdir|
             next
           end
           check_duplication(defs, $1, fn, $.)
-          lines << line.sub(/;.*/m, "").chomp + ";\n" if line
+          lines << line.sub(/;.*/m, "").chomp + ";" if line
         end
       end
     end
   end
 end
+encodings.each do |e|
+%>ENC_DEFINE("<%=e%>");
+% end
+% lines.each do |line|
+<%=line%>
+% end
 
-result = encodings.map {|e| %[ENC_DEFINE("#{e}");\n]}.join + lines.join + 
-  "\n#define ENCODING_COUNT #{count}\n"
-open(outhdr, 'wb') do |f|
-  f.print result
-end
+#define ENCODING_COUNT <%=count%>
diff --git a/enc/trans/make_transdb.rb b/template/transdb.h.tmpl
similarity index 87%
rename from enc/trans/make_transdb.rb
rename to template/transdb.h.tmpl
index 4f11abd35a..d0cf101344 100644
--- a/enc/trans/make_transdb.rb
+++ b/template/transdb.h.tmpl
@@ -1,3 +1,4 @@
+<%
 #
 # static const rb_transcoder
 # rb_from_US_ASCII = {
@@ -9,7 +10,6 @@
 count = 0
 converters = {}
 transdirs = ARGV.dup
-outhdr = transdirs.shift || 'transdb.h'
 transdirs << 'enc/trans' if transdirs.empty?
 
 transdirs = transdirs.sort_by {|td|
@@ -53,9 +53,7 @@ transdirs.each do |transdir|
     end
   end
 end
-result = converter_list.map do |from_to|
-  %[rb_declare_transcoder("%s", "%s", "%s");\n] % converters[from_to]
-end.join("")
-open(outhdr, 'wb') do |f|
-  f.print result
-end
+converter_list.each do |from_to|
+  from, to, fn = *converters[from_to]
+%>rb_declare_transcoder("<%=from%>", "<%=to%>", "<%=fn%>");
+% end