diff -Nru gnat-4.6ubuntu2/debian/changelog gnat-4.6ubuntu4/debian/changelog
--- gnat-4.6ubuntu2/debian/changelog	2013-12-27 16:33:51.000000000 +0000
+++ gnat-4.6ubuntu4/debian/changelog	2014-04-03 12:26:29.000000000 +0000
@@ -1,3 +1,15 @@
+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.
+
+ -- Matthias Klose <doko@ubuntu.com>  Wed, 26 Mar 2014 22:10:44 +0100
+
 gnat (4.6ubuntu2) trusty; urgency=medium
 
   * Depend on gnat-4.8 on arm64 and ppc64el.
diff -Nru gnat-4.6ubuntu2/debian/control gnat-4.6ubuntu4/debian/control
--- gnat-4.6ubuntu2/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
diff -Nru gnat-4.6ubuntu2/debian/rules gnat-4.6ubuntu4/debian/rules
--- gnat-4.6ubuntu2/debian/rules	2011-10-13 15:15:53.000000000 +0000
+++ gnat-4.6ubuntu4/debian/rules	2014-04-03 12:26:37.000000000 +0000
@@ -1,5 +1,13 @@
 #!/usr/bin/make -f
 
+DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)
+
+ifneq (,$(filter $(DEB_HOST_ARCH), arm64 ppc64el))
+  VER = 4.8
+else
+  VER = 4.6
+endif
+
 build build-arch build-indep:
 
 binary: binary-arch binary-indep
@@ -7,14 +15,14 @@
 binary-arch: build
 	dh_testdir
 	dh_testroot
-	dh_link -pgnat /usr/bin/gcc-4.6 /usr/bin/gnatgcc
+	dh_link -pgnat /usr/bin/gcc-$(VER) /usr/bin/gnatgcc
 	dh_link -pgnat /usr/share/man/man1/gnat.1.gz /usr/share/man/man1/gnatgcc.1.gz
 	dh_installdirs -pgnat-doc \
 		usr/share/doc usr/share/info
 	dh_link -pgnat-doc \
-	  /usr/share/info/gnat_ugn_unw-4.6.info.gz /usr/share/info/gnat_ugn_unw.info.gz \
-	  /usr/share/info/gnat_rm-4.6.info.gz /usr/share/info/gnat_rm.info.gz \
-	  /usr/share/info/gnat_style-4.6.info.gz /usr/share/info/gnat_style.info.gz
+	  /usr/share/info/gnat_ugn_unw-$(VER).info.gz /usr/share/info/gnat_ugn_unw.info.gz \
+	  /usr/share/info/gnat_rm-$(VER).info.gz /usr/share/info/gnat_rm.info.gz \
+	  /usr/share/info/gnat_style-$(VER).info.gz /usr/share/info/gnat_style.info.gz
 	dh_gencontrol
 	dh_installdocs
 	dh_installchangelogs