diff --git a/pkgs/tools/package-management/nix/0001-Added-support-for-passing-an-impure-NIX_BUILD_CORES-.patch b/pkgs/tools/package-management/nix/0001-Added-support-for-passing-an-impure-NIX_BUILD_CORES-.patch
deleted file mode 100644
index e5c4ba1b01e0..000000000000
--- a/pkgs/tools/package-management/nix/0001-Added-support-for-passing-an-impure-NIX_BUILD_CORES-.patch
+++ /dev/null
@@ -1,126 +0,0 @@
-From 9c655f52be055d06cbeb3144e14d6135a8d408e0 Mon Sep 17 00:00:00 2001
-From: Peter Simons <simons@cryp.to>
-Date: Tue, 22 Jun 2010 16:59:03 +0200
-Subject: [PATCH] Added support for passing an (impure) NIX_BUILD_CORES variable to build expressions.
-
-This patch adds the configuration file variable "build-cores" and the
-command line argument "--cores". These settings specify the number of
-CPU cores to utilize for parallel building within a job, i.e. by passing
-an appropriate "-j" flag to GNU Make. The default value is 1, which
-means that parallel building is *disabled*. If the number of build cores
-is specified as 0 (synonymously: "guess" or "auto"), then the actual
-value is supposed to be auto-detected by builders at run-time, i.e by
-calling the nproc(1) utility from coreutils.
-
-The environment variable $NIX_BUILD_CORES is available to builders, but
-the contents of that variable does *not* influence the hash that goes
-into the $out store path, i.e. the number of build cores to be utilized
-can be changed at will without requiring any re-builds.
----
- nix.conf.example        |   12 ++++++++++++
- src/libmain/shared.cc   |   14 ++++++++++++++
- src/libstore/build.cc   |    3 +++
- src/libstore/globals.cc |    1 +
- src/libstore/globals.hh |    5 +++++
- 5 files changed, 35 insertions(+), 0 deletions(-)
-
-diff --git a/nix.conf.example b/nix.conf.example
-index e17cf3c..6175d86 100644
---- a/nix.conf.example
-+++ b/nix.conf.example
-@@ -59,6 +59,18 @@
- #build-max-jobs = 1
- 
- 
-+### Option `build-cores'
-+#
-+# This option defines the number of CPU cores to utilize in parallel
-+# within a build job, i.e. by passing an appropriate `-jN' flag to
-+# GNU make. The default is 1, meaning that parallel building within
-+# jobs is disabled. Passing the special values `0', `auto', or
-+# `guess' causes Nix to try and auto-detect the number of available
-+# cores on the local host. This setting can be overridden using the
-+# `--cores' command line switch.
-+#build-cores = 1
-+
-+
- ### Option `build-max-silent-time'
- #
- # This option defines the maximum number of seconds that a builder can
-diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
-index 3fbec4b..19aa1e7 100644
---- a/src/libmain/shared.cc
-+++ b/src/libmain/shared.cc
-@@ -135,6 +135,12 @@ static void initAndRun(int argc, char * * argv)
-     /* Get some settings from the configuration file. */
-     thisSystem = querySetting("system", SYSTEM);
-     maxBuildJobs = queryIntSetting("build-max-jobs", 1);
-+    string tmp = querySetting("build-cores", "/UNDEFINED");
-+    std::transform(tmp.begin(), tmp.end(), tmp.begin(), tolower);
-+    if (tmp == "auto" || tmp == "guess")
-+      buildCores = 0;
-+    else
-+      buildCores = queryIntSetting("build-cores", 1);
-     maxSilentTime = queryIntSetting("build-max-silent-time", 0);
- 
-     /* Catch SIGINT. */
-@@ -226,6 +232,14 @@ static void initAndRun(int argc, char * * argv)
-             tryFallback = true;
-         else if (arg == "--max-jobs" || arg == "-j")
-             maxBuildJobs = getIntArg<unsigned int>(arg, i, args.end());
-+        else if (arg == "--cores") {
-+            string tmp = *(++i);
-+            std::transform(tmp.begin(), tmp.end(), tmp.begin(), tolower);
-+            if (tmp == "auto" || tmp == "guess")
-+              buildCores = 0u;
-+            else
-+              buildCores = getIntArg<unsigned int>(arg, --i, args.end());
-+        }
-         else if (arg == "--readonly-mode")
-             readOnlyMode = true;
-         else if (arg == "--max-silent-time")
-diff --git a/src/libstore/build.cc b/src/libstore/build.cc
-index f901c1f..a53c23b 100644
---- a/src/libstore/build.cc
-+++ b/src/libstore/build.cc
-@@ -1411,6 +1411,9 @@ void DerivationGoal::startBuilder()
-        in the store or in the build directory). */
-     env["NIX_STORE"] = nixStore;
- 
-+    /* The maximum number of cores to utilize for parallel building. */
-+    env["NIX_BUILD_CORES"] = (format("%d") % buildCores).str();
-+
-     /* Add all bindings specified in the derivation. */
-     foreach (StringPairs::iterator, i, drv.env)
-         env[i->first] = i->second;
-diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
-index cc0e44e..75d2f69 100644
---- a/src/libstore/globals.cc
-+++ b/src/libstore/globals.cc
-@@ -22,6 +22,7 @@ bool keepGoing = false;
- bool tryFallback = false;
- Verbosity buildVerbosity = lvlInfo;
- unsigned int maxBuildJobs = 1;
-+unsigned int buildCores = 1;
- bool readOnlyMode = false;
- string thisSystem = "unset";
- time_t maxSilentTime = 0;
-diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
-index d3388e3..a74a741 100644
---- a/src/libstore/globals.hh
-+++ b/src/libstore/globals.hh
-@@ -55,6 +55,11 @@ extern Verbosity buildVerbosity;
- /* Maximum number of parallel build jobs.  0 means unlimited. */
- extern unsigned int maxBuildJobs;
- 
-+/* Number of CPU cores to utilize in parallel within a build, i.e. by passing
-+   this number to Make via '-j'. 0 means that the number of actual CPU cores on
-+   the local host ought to be auto-detected. */
-+extern unsigned int buildCores;
-+
- /* Read-only mode.  Don't copy stuff to the store, don't change the
-    database. */
- extern bool readOnlyMode;
--- 
-1.7.1
-