diff -ur gtk-doc-1.18.orig/debian/control gtk-doc-1.18/debian/control
--- gtk-doc-1.18.orig/debian/control	2011-09-15 07:35:03.000000000 +0000
+++ gtk-doc-1.18/debian/control	2012-03-16 16:22:36.000000000 +0000
@@ -44,6 +44,7 @@
          gnome-common
 Conflicts: sgml2x (<< 1.0.0-2)
 Recommends: pkg-config (>= 0.19.0)
+Multi-Arch: foreign
 Description: GTK+ documentation tools
  These tools extract documentation embedded in GNOME source code, and
  produce pretty output via DocBook SGML.
diff -ur gtk-doc-1.18.orig/debian/control.in gtk-doc-1.18/debian/control.in
--- gtk-doc-1.18.orig/debian/control.in	2011-09-15 07:34:56.000000000 +0000
+++ gtk-doc-1.18/debian/control.in	2012-03-16 16:22:22.000000000 +0000
@@ -39,6 +39,7 @@
          gnome-common
 Conflicts: sgml2x (<< 1.0.0-2)
 Recommends: pkg-config (>= 0.19.0)
+Multi-Arch: foreign
 Description: GTK+ documentation tools
  These tools extract documentation embedded in GNOME source code, and
  produce pretty output via DocBook SGML.