debian/changelog

+umis (1.0.3-2) unstable; urgency=medium
+
+  * Build-Depends-Arch: python3-pysam
+    Closes: #930040
+
+ -- Andreas Tille <tille@debian.org>  Thu, 06 Jun 2019 06:50:09 +0200
+
 umis (1.0.3-1) unstable; urgency=medium
 
   * Initial release (Closes: #926995)

debian/control

@@ -8,6 +8,7 @@ Build-Depends: debhelper (>= 12~),
                cython3,
                python3-dev,
                python3-setuptools
+Build-Depends-Arch: python3-pysam
 Standards-Version: 4.3.0
 Vcs-Browser: https://salsa.debian.org/med-team/umis
 Vcs-Git: https://salsa.debian.org/med-team/umis.git