codebase-memory-mcp: use makeFlags and makefile (#536349)

pkgs/by-name/co/codebase-memory-mcp/package.nix

@@ -14,22 +14,29 @@ stdenv.mkDerivation (finalAttrs: {
     rev = "v${finalAttrs.version}";
     hash = "sha256-H0l8H2JhPT1Rs0p+CJC1a1qYtnZNgLGe6n7PmM+WvE4=";
   };
+
   nativeBuildInputs = [ gnumake ];
+
   buildInputs = [ zlib ];
+
   strictDeps = true;
   __structuredAttrs = true;
+
+  makefile = "Makefile.cbm";
+
   # scripts/build.sh verifies CC via `file`, which fails on Nix's compiler wrapper.
   # Call make directly — mirrors upstream flake.nix.
-  buildPhase = ''
-    runHook preBuild
-    make -j$NIX_BUILD_CORES -f Makefile.cbm cbm CFLAGS_EXTRA='-DCBM_VERSION=\"${finalAttrs.version}\"'
-    runHook postBuild
-  '';
+  makeFlags = [
+    "cbm"
+    "CFLAGS_EXTRA='-DCBM_VERSION=\"${finalAttrs.version}\"'"
+  ];
+
   installPhase = ''
     runHook preInstall
     install -Dm755 build/c/codebase-memory-mcp $out/bin/codebase-memory-mcp
     runHook postInstall
   '';
+
   meta = {
     homepage = "https://github.com/DeusData/codebase-memory-mcp";
     description = "High-performance C11 MCP server that indexes codebases into a persistent knowledge graph";