diff --git a/pkgs/additional/sysvol/default.nix b/pkgs/additional/sysvol/default.nix
index e4af5720..61b10f0b 100644
--- a/pkgs/additional/sysvol/default.nix
+++ b/pkgs/additional/sysvol/default.nix
@@ -15,6 +15,15 @@ stdenv.mkDerivation (finalAttrs: {
     rev = "b8a15ca2e52922bceab3f48c5630149674da57e9";
     hash = "sha256-BaefSRnn6ww3Ut+3ouXKoI/8/vmcPh/QV6dEETr3tog=";
   };
+  postPatch = let
+    # i don't know how else to escape this
+    var = v: lib.concatStrings [ "$" "{" v "}" ];
+  in ''
+    substituteInPlace Makefile \
+      --replace-fail 'pkg-config' '${var "PKG_CONFIG"}' \
+      --replace-fail 'g++' '${var "CXX"}' \
+      --replace-fail 'strip sysvol' ""
+  '';
 
   nativeBuildInputs = [
     pkg-config