1 files changed, 33 insertions, 25 deletions
diff --git a/nixpkgs/pkgs/development/tools/build-managers/ninja/setup-hook.sh b/nixpkgs/pkgs/development/tools/build-managers/ninja/setup-hook.sh
index 63fa7d8f16f7..7fa5e4675f39 100644
--- a/nixpkgs/pkgs/development/tools/build-managers/ninja/setup-hook.sh
+++ b/nixpkgs/pkgs/development/tools/build-managers/ninja/setup-hook.sh
@@ -9,7 +9,7 @@ ninjaBuildPhase() {
     fi
 
     local flagsArray=(
-        -j$buildCores -l$NIX_BUILD_CORES
+        -j$buildCores
         $ninjaFlags "${ninjaFlagsArray[@]}"
     )
 
@@ -19,29 +19,6 @@ ninjaBuildPhase() {
     runHook postBuild
 }
 
-if [ -z "${dontUseNinjaBuild-}" -a -z "${buildPhase-}" ]; then
-    buildPhase=ninjaBuildPhase
-fi
-
-ninjaInstallPhase() {
-    runHook preInstall
-
-    # shellcheck disable=SC2086
-    local flagsArray=(
-        $ninjaFlags "${ninjaFlagsArray[@]}"
-        ${installTargets:-install}
-    )
-
-    echoCmd 'install flags' "${flagsArray[@]}"
-    TERM=dumb ninja "${flagsArray[@]}"
-
-    runHook postInstall
-}
-
-if [ -z "${dontUseNinjaInstall-}" -a -z "${installPhase-}" ]; then
-    installPhase=ninjaInstallPhase
-fi
-
 ninjaCheckPhase() {
     runHook preCheck
 
@@ -61,7 +38,7 @@ ninjaCheckPhase() {
         fi
 
         local flagsArray=(
-            -j$buildCores -l$NIX_BUILD_CORES
+            -j$buildCores
             $ninjaFlags "${ninjaFlagsArray[@]}"
             $checkTarget
         )
@@ -73,6 +50,37 @@ ninjaCheckPhase() {
     runHook postCheck
 }
 
+ninjaInstallPhase() {
+    runHook preInstall
+
+    local buildCores=1
+
+    # Parallel building is enabled by default.
+    if [ "${enableParallelInstalling-1}" ]; then
+        buildCores="$NIX_BUILD_CORES"
+    fi
+
+    # shellcheck disable=SC2086
+    local flagsArray=(
+        -j$buildCores
+        $ninjaFlags "${ninjaFlagsArray[@]}"
+        ${installTargets:-install}
+    )
+
+    echoCmd 'install flags' "${flagsArray[@]}"
+    TERM=dumb ninja "${flagsArray[@]}"
+
+    runHook postInstall
+}
+
+if [ -z "${dontUseNinjaBuild-}" -a -z "${buildPhase-}" ]; then
+    buildPhase=ninjaBuildPhase
+fi
+
 if [ -z "${dontUseNinjaCheck-}" -a -z "${checkPhase-}" ]; then
     checkPhase=ninjaCheckPhase
 fi
+
+if [ -z "${dontUseNinjaInstall-}" -a -z "${installPhase-}" ]; then
+    installPhase=ninjaInstallPhase
+fi