gnu: procps: Make procps build on non Linux systems.

* gnu/packages/patches/procps-non-linux.patch.patch: New patch.
* gnu/packages/linux.scm (procps)[source]: Use it.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -683,6 +683,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/poppler-CVE-2015-8868.patch		\
   gnu/packages/patches/portaudio-audacity-compat.patch		\
   gnu/packages/patches/procmail-ambiguous-getline-debian.patch  \
+  gnu/packages/patches/procps-non-linux.patch			\
   gnu/packages/patches/pt-scotch-build-parallelism.patch	\
   gnu/packages/patches/pulseaudio-fix-mult-test.patch		\
   gnu/packages/patches/pulseaudio-longer-test-timeout.patch	\

gnu/packages/linux.scm

@@ -535,7 +535,9 @@ block devices, UUIDs, TTYs, and many other tools.")
                                   "procps-ng-" version ".tar.xz"))
               (sha256
                (base32
-                "1va4n0mpsq327ca9dqp4hnrpgs6821rp0f2m0jyc1bfjl9lk2jg9"))))
+                "1va4n0mpsq327ca9dqp4hnrpgs6821rp0f2m0jyc1bfjl9lk2jg9"))
+              (patches
+               (list (search-patch "procps-non-linux.patch")))))
     (build-system gnu-build-system)
     (arguments
      '(#:modules ((guix build utils)

gnu/packages/patches/procps-non-linux.patch

@@ -0,0 +1,40 @@
+From aa9bd38d0a6fe53aff7f78fb2d9f61e55677c7b5 Mon Sep 17 00:00:00 2001
+From: Craig Small <csmall@enc.com.au>
+Date: Sun, 17 Apr 2016 09:09:41 +1000
+Subject: [PATCH] tests: Conditionally add prctl to test process
+
+prctl was already bypassed on Cygwin systems. This extends to
+non-Linux systems such as kFreeBSD and Hurd.
+
+---
+ lib/test_process.c | 4 ++--
+ 2 files changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/lib/test_process.c b/lib/test_process.c
+index 6e652ed..6a4776c 100644
+--- a/lib/test_process.c
++++ b/lib/test_process.c
+@@ -21,7 +21,9 @@
+ #include <stdlib.h>
+ #include <unistd.h>
+ #include <signal.h>
++#ifdef __linux__
+ #include <sys/prctl.h>
++#endif
+ #include "c.h"
+ 
+ #define DEFAULT_SLEEPTIME 300
+@@ -78,8 +80,10 @@
+     sigaction(SIGUSR1, &signal_action, NULL);
+     sigaction(SIGUSR2, &signal_action, NULL);
+ 
++#ifdef __linux__
+     /* set process name */
+     prctl(PR_SET_NAME, MY_NAME, NULL, NULL, NULL);
++#endif
+ 
+     while (sleep_time > 0) {
+ 	sleep_time = sleep(sleep_time);
+-- 
+2.8.2
+