Really disable parallel execution of upstream Makefile under xvfb.

debian/changelog

+taskcoach (1.4.3-7) unstable; urgency=medium
+
+  * Really disable parallel execution of upstream Makefile under xvfb.
+  * Migrate VCS-* to salsa.debian.org.
+  * Drop obsolete suggest: python-kde4.
+
+ -- Nicolas Boulenguez <nicolas@debian.org>  Tue, 24 Apr 2018 11:15:20 +0200
+
 taskcoach (1.4.3-6) unstable; urgency=medium
 
   * Update path for python-wxgtk3.0 (>= 3.0.1.1+dfsg-2~). Closes: #895512.

debian/rules

@@ -9,7 +9,7 @@ override_dh_auto_clean::
 override_dh_auto_build: override_%:
 # img2py needs an X display to convert images.
 # Do not mix xvfb-run and parallelism.
-	xvfb-run $(MAKE) prepare
+	xvfb-run $(MAKE) -j1 prepare
 	$* --buildsystem=python_distutils
 override_dh_auto_install:: override_%:
 	$* --buildsystem=python_distutils