exclude some of the b-d on archs where they are not available

debian/changelog

+matplotlib (2.2.2-4) UNRELEASED; urgency=medium
+
+  * debian/control
+    - exclude some of the b-d on archs where they are not available
+
+ -- Sandro Tosi <morph@debian.org>  Wed, 23 May 2018 19:46:29 -0400
+
 matplotlib (2.2.2-3) unstable; urgency=medium
 
   [ Ondřej Nový ]

debian/control

@@ -5,10 +5,10 @@ Maintainer: Sandro Tosi <morph@debian.org>
 Uploaders: Debian Python Modules Team <python-modules-team@lists.alioth.debian.org>
 Build-Depends: debhelper (>= 7),
                dh-python,
-               dvipng,
+               dvipng [!sparc64],
                ghostscript,
                graphviz,
-               inkscape,
+               inkscape [!kfreebsd-amd64],
                ipython,
                libfreetype6-dev,
                libpng-dev,
@@ -24,8 +24,8 @@ Build-Depends: debhelper (>= 7),
                python3-dateutil,
                python-colorspacious,
                python3-colorspacious,
-               python-cairocffi,
-               python3-cairocffi,
+               python-cairocffi [!ia64],
+               python3-cairocffi [!ia64],
                python-cxx-dev,
                python3-cxx-dev,
                python-functools32,
@@ -48,8 +48,8 @@ Build-Depends: debhelper (>= 7),
                python-numpydoc,
                python3-numpy,
                python3-numpy-dbg,
-               python-pandas [!armhf],
-               python3-pandas [!armhf],
+               python-pandas [!armhf !hppa !m68k !powerpcspe !riscv64 !sh4 !x32],
+               python3-pandas [!armhf !hppa !m68k !powerpcspe !riscv64 !sh4 !x32],
                python-pil,
                python3-pil,
                python-pkg-resources,
@@ -60,8 +60,8 @@ Build-Depends: debhelper (>= 7),
                python3-pytest,
                python-qt4,
                python3-pyqt4,
-               python-pyqt5,
-               python3-pyqt5,
+               python-pyqt5 [!alpha !hurd-i386],
+               python3-pyqt5 [!alpha !hurd-i386],
                python-scipy,
                python-setuptools,
                python3-setuptools,