debian/changelog

+gfapy (1.0.0+dfsg-4) unstable; urgency=medium
+
+  * Add missing build-dep on dh-python, fixing FTBFS.
+  * Use debhelper 12 and debhelper-compat.
+
+ -- Sascha Steinbiss <satta@debian.org>  Tue, 14 Jan 2020 12:00:19 +0100
+
 gfapy (1.0.0+dfsg-3) unstable; urgency=medium
 
   * Team upload.

debian/compat

-11

debian/control

@@ -3,7 +3,8 @@ Maintainer: Debian Med Packaging Team <debian-med-packaging@lists.alioth.debian.
 Uploaders: Sascha Steinbiss <satta@debian.org>
 Section: science
 Priority: optional
-Build-Depends: debhelper (>= 11~),
+Build-Depends: debhelper-compat (= 12),
+               dh-python,
                python3,
                python3-dev,
                python3-setuptools,