diff -Nru gnat-4.6ubuntu3/debian/changelog gnat-4.6ubuntu4/debian/changelog
--- gnat-4.6ubuntu3/debian/changelog	2014-03-26 21:11:28.000000000 +0000
+++ gnat-4.6ubuntu4/debian/changelog	2014-04-03 12:26:29.000000000 +0000
@@ -1,3 +1,9 @@
+gnat (4.6ubuntu4) trusty; urgency=medium
+
+  * Don't build the package on AArch64.
+
+ -- Matthias Klose <doko@ubuntu.com>  Thu, 03 Apr 2014 14:25:09 +0200
+
 gnat (4.6ubuntu3) trusty; urgency=medium
 
   * Link to gcc-4.8 on arm64 and ppc64el.
diff -Nru gnat-4.6ubuntu3/debian/control gnat-4.6ubuntu4/debian/control
--- gnat-4.6ubuntu3/debian/control	2013-12-27 16:33:41.000000000 +0000
+++ gnat-4.6ubuntu4/debian/control	2014-04-03 12:26:11.000000000 +0000
@@ -8,7 +8,7 @@
 XS-VCS-Browser: http://www.ada-france.org:8081/branch/changes/org.debian.gnat
 
 Package: gnat
-Architecture: any
+Architecture: amd64 armhf i386 powerpc ppc64el
 Depends: gnat-4.6 [!arm64 !ppc64el], gnat-4.8 [arm64 ppc64el], ${misc:Depends}
 Recommends: ada-reference-manual, gnat-gps
 Description: GNU Ada compiler