Only build on Linux architectures; this package is specifically not portable

debian/changelog

@@ -29,6 +29,8 @@ ostree (2016.3-1) UNRELEASED; urgency=medium
     symlink in ostree-grub2
   * Document the limited situations in which ostree-grub2 will work in
     practice
+  * Only build on Linux architectures; this package is specifically
+    not portable
 
  -- Simon McVittie <smcv@debian.org>  Wed, 27 Jan 2016 13:04:34 +0100
 

debian/control

@@ -35,7 +35,7 @@ Vcs-Git: https://anonscm.debian.org/git/collab-maint/ostree.git
 Vcs-Browser: https://anonscm.debian.org/cgit/collab-maint/ostree.git
 
 Package: gir1.2-ostree-1.0
-Architecture: any
+Architecture: linux-any
 Section: introspection
 Depends:
  ${gir:Depends},
@@ -48,7 +48,7 @@ Description: content-addressed filesystem for operating system binaries (introsp
  to generate dynamic bindings into languages such as Python and JavaScript.
 
 Package: libostree-1-1
-Architecture: any
+Architecture: linux-any
 Section: libs
 Depends:
  ${misc:Depends},
@@ -69,7 +69,7 @@ Description: content-addressed filesystem for operating system binaries (library
  This package contains the shared library.
 
 Package: libostree-dev
-Architecture: any
+Architecture: linux-any
 Section: libdevel
 Depends:
  gir1.2-ostree-1.0 (= ${binary:Version}),
@@ -105,7 +105,7 @@ Description: Development documentation for the ostree library
  This package contains development documentation for ostree.
 
 Package: ostree
-Architecture: any
+Architecture: linux-any
 Depends:
  ${misc:Depends},
  ${shlibs:Depends},
@@ -145,7 +145,7 @@ Description: GRUB 2 configuration for ostree
  See README.Debian.gz for more details.
 
 Package: ostree-tests
-Architecture: any
+Architecture: linux-any
 Depends:
  ${misc:Depends},
  ${shlibs:Depends},