diff --git a/pkgs/os-specific/darwin/apple-source-releases/CoreOSMakefiles/default.nix b/pkgs/os-specific/darwin/apple-source-releases/CoreOSMakefiles/default.nix
deleted file mode 100644
index 203ca010d62..00000000000
--- a/pkgs/os-specific/darwin/apple-source-releases/CoreOSMakefiles/default.nix
+++ /dev/null
@@ -1,30 +0,0 @@
-{ stdenv, appleDerivation, unifdef }:
-
-appleDerivation {
-  buildInputs = [ unifdef ];
-
-  phases = [ "unpackPhase" "installPhase" ];
-
-  preInstall = ''
-    substituteInPlace Makefile \
-      --replace "rsync -a --exclude=.svn --exclude=.git" "cp -r"
-
-    substituteInPlace Standard/Commands.in \
-      --replace "/bin/sh" "bash" \
-      --replace "/usr/bin/compress" "compress" \
-      --replace "/usr/bin/gzip" "gzip" \
-      --replace "/bin/pax" "pax" \
-      --replace "/usr/bin/tar" "tar" \
-      --replace "xcrun -find" "echo" \
-      --replace '$(Install_Program_Group)   -s' '$(Install_Program_Group)' \
-      --replace '$(Install_Program_Mode)   -s'  '$(Install_Program_Mode)'
-
-    substituteInPlace ReleaseControl/Common.make \
-      --replace "/tmp" "$TMPDIR"
-
-    substituteInPlace ReleaseControl/BSDCommon.make \
-      --replace '$(shell xcrun -find -sdk $(SDKROOT) cc)' "cc"
-
-    export DSTROOT=$out
-  '';
-}
diff --git a/pkgs/os-specific/darwin/apple-source-releases/default.nix b/pkgs/os-specific/darwin/apple-source-releases/default.nix
index 69dc2283645..31978ae9e44 100644
--- a/pkgs/os-specific/darwin/apple-source-releases/default.nix
+++ b/pkgs/os-specific/darwin/apple-source-releases/default.nix
@@ -115,9 +115,6 @@ let
     "osx-10.5.8" = {
       adv_cmds = "119";
     };
-    "osx-10.5" = {
-      CoreOSMakeFiles = "40";
-    };
     "dev-tools-7.0" = {
       bootstrap_cmds = "93";
     };
@@ -195,7 +192,6 @@ let
     CommonCrypto    = applePackage "CommonCrypto"      "osx-10.11.6"     "0vllfpb8f4f97wj2vpdd7w5k9ibnsbr6ff1zslpp6q323h01n25y" {};
     configd         = applePackage "configd"           "osx-10.8.5"      "1gxakahk8gallf16xmhxhprdxkh3prrmzxnmxfvj0slr0939mmr2" {};
     copyfile        = applePackage "copyfile"          "osx-10.11.6"     "1rkf3iaxmjz5ycgrmf0g971kh90jb2z1zqxg5vlqz001s4y457gs" {};
-    CoreOSMakefiles = applePackage "CoreOSMakefiles"   "osx-10.5"        "0kxp53spbn7109l7cvhi88pmfsi81lwmbws819b6wr3hm16v84f4" {};
     Csu             = applePackage "Csu"               "osx-10.11.6"     "0yh5mslyx28xzpv8qww14infkylvc1ssi57imhi471fs91sisagj" {};
     dtrace          = applePackage "dtrace"            "osx-10.11.6"     "0pp5x8dgvzmg9vvg32hpy2brm17dpmbwrcr4prsmdmfvd4767wc0" {};
     dyld            = applePackage "dyld"              "osx-10.11.6"     "0qkjmjazm2zpgvwqizhandybr9cm3gz9pckx8rmf0py03faafc08" {};