Index: debian/rules
===================================================================
--- debian/rules	(.../anbe-320-legacy-support-5-control)	(revision 2436)
+++ debian/rules	(.../anbe-325-conditional-overrides)	(revision 2436)
@@ -153,6 +153,8 @@
 	-e 's{#LEGACY#}{$(legacy)}g;' \
 	-e 's{#URL_X86#}{$(url_x86)}g;' \
 	-e 's{#URL_X86_64#}{$(url_x86_64)}g;' \
+	-e 's{#!i386#}{$(if $(filter i386,$(DEB_BUILD_ARCH)),#)}g;' \
+	-e 's{#!amd64#}{$(if $(filter amd64,$(DEB_BUILD_ARCH)),#)}g;' \
 	< $< > $@
 
 debian/module/debian/changelog: debian/changelog
Index: debian/changelog
===================================================================
--- debian/changelog	(.../anbe-320-legacy-support-5-control)	(revision 2436)
+++ debian/changelog	(.../anbe-325-conditional-overrides)	(revision 2436)
@@ -144,6 +144,8 @@
     add #LEGACY#
   * debian/rules: automatically rename control files when building legacy
     packages
+  * debian/rules: add new substitution placeholders #!i386#, #!amd64# that are
+    substituted with '#' on the respective architecture and '' elsewhere
 
  -- Russ Allbery <rra@debian.org>  Sat, 24 Apr 2010 20:35:20 -0700