cpulimit: use github sources at 0.2

The sourceforge page of limitCPU says the following:

> Update: Mr Marletta has re-launched his CPUlimit project, adding new
> features and improving OS X support. The new project is a re-write
> and should not be considered drop-in compatible with this
> project. The source code of the new CPUlimit project can be found on
> github. We here at the LimitCPU project will continue to work with
> downstream projects and with the resurrected CPUlimit project so
> that both projects may grow and improve.

pkgs/tools/misc/cpulimit/default.nix

@@ -1,27 +1,29 @@
-{lib, stdenv, fetchurl}:
+{ lib, stdenv, fetchFromGitHub }:
 
 stdenv.mkDerivation rec {
   pname = "cpulimit";
-  version = "2.7";
+  version = "0.2";
 
-  src = fetchurl {
-    url = "mirror://sourceforge/limitcpu/${pname}-${version}.tar.gz";
-    sha256 = "sha256-HeBApPikDf6MegJf6YB1ZzRo+8P8zMvCMbx0AvYuxKA=";
+  src = fetchFromGitHub {
+    owner = "opsengine";
+    repo = "cpulimit";
+    rev = "v${version}";
+    sha256 = "1dz045yhcsw1rdamzpz4bk8mw888in7fyqk1q1b3m1yk4pd1ahkh";
   };
 
-  buildFlags = with stdenv; [ (
-    if isDarwin then "osx"
-    else if isFreeBSD then "freebsd"
-    else "cpulimit"
-  ) ];
+  patches = [ ./remove-sys-sysctl.h.patch ./get-missing-basename.patch ];
 
-  installFlags = [ "PREFIX=$(out)" ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp src/cpulimit $out/bin
+  '';
 
   meta = with lib; {
-    homepage = "http://limitcpu.sourceforge.net/";
-    description = "A tool to throttle the CPU usage of programs";
-    platforms = with platforms; linux ++ freebsd;
+    homepage = "https://github.com/opsengine/cpulimit";
+    description = "CPU usage limiter";
+    platforms = platforms.unix;
     license = licenses.gpl2;
-    maintainers = [maintainers.rycee];
+    maintainers = [ maintainers.jsoo1 ];
   };
 }

pkgs/tools/misc/cpulimit/get-missing-basename.patch

@@ -0,0 +1,12 @@
+diff --git a/src/process_group.c b/src/process_group.c
+index 06d73a6..3ca66b0 100644
+--- a/src/process_group.c
++++ b/src/process_group.c
+@@ -20,6 +20,7 @@
+  */
+ 
+ #include <string.h>
++#include <libgen.h>
+ #include <stdlib.h>
+ #include <limits.h>
+ #include <sys/time.h>

pkgs/tools/misc/cpulimit/remove-sys-sysctl.h.patch

@@ -0,0 +1,21 @@
+Remove references to sys/sysctl.h which were deprecated long ago.
+
+diff --git a/src/cpulimit.c b/src/cpulimit.c
+index 50eabea..eba4615 100644
+--- a/src/cpulimit.c
++++ b/src/cpulimit.c
+@@ -38,7 +38,9 @@
+ #include <string.h>
+ #include <sys/stat.h>
+ #include <sys/time.h>
++#ifdef __APPLE__
+ #include <sys/sysctl.h>
++#endif
+ #include <sys/resource.h>
+ #include <sys/types.h>
+ #include <sys/wait.h>
+
+-#ifdef __APPLE__ || __FREEBSD__
++#if defined(__APPLE__) || defined(__FREEBSD__)
+ #include <libgen.h>
+ #endif