debian/changelog

+abyss (2.1.5-4) unstable; urgency=medium
+
+  * Fix build on hurd due to missing header file (thanks for the patch
+    to Samuel Thibault <sthibault@debian.org>)
+    Closes: #920240
+  * debhelper 12
+
+ -- Andreas Tille <tille@debian.org>  Wed, 23 Jan 2019 15:49:21 +0100
+
 abyss (2.1.5-3) unstable; urgency=medium
 
   * Re-add armel architecture

debian/compat

-11
+12

debian/control

@@ -3,7 +3,7 @@ Maintainer: Debian Med Packaging Team <debian-med-packaging@lists.alioth.debian.
 Uploaders: Andreas Tille <tille@debian.org>
 Section: science
 Priority: optional
-Build-Depends: debhelper (>= 11~),
+Build-Depends: debhelper (>= 12~),
                python-markdown,
                libboost-graph-dev,
                libopenmpi-dev,

debian/patches/hurd.patch

+From: Samuel Thibault <sthibault@debian.org>
+Date: Wed, 23 Jan 2019 09:45:27 +0100
+Bug-Debian: https://bugs.debian.org/920240
+Description: Fix build on hurd due to missing header file
+
+--- a/Common/MemoryUtil.h
++++ b/Common/MemoryUtil.h
+@@ -7,8 +7,14 @@
+ #include <unistd.h> // for sbrk
+ 
+ #if __MACH__
+-# include <mach/mach.h> // for mach_task_self
+-# include <mach/task.h> // for task_info
++# ifdef __APPLE__
++#  include <mach/mach.h> // for mach_task_self
++#  include <mach/task.h> // for task_info
++# else
++extern "C" {
++#  include <mach/mach.h> // for mach_task_self and task_info
++}
++# endif
+ #endif
+ 
+ /** Return the number of bytes used by the data and stack segments.

debian/patches/series

@@ -4,3 +4,4 @@ abyss-32-bit.patch
 fix_bash_script.patch
 big_endian.patch
 strict_alignment.patch
+hurd.patch