override zlog with pkgconf data

default.nix

@@ -8,9 +8,13 @@ let
     cedro = cedro;
     capnpc = capnpc;
   };
+  zlog_with_pkgconf = callPackage ./pkgs/z/zlog/package.nix {
+    with_pkgconf = true;
+  };
 in
 {
   xbuild = xbuild;
   capnpc = capnpc;
   cedro  = cedro;
+  zlog_with_pkgconf = zlog_with_pkgconf;
 }

pkgs/z/zlog/package.nix

@@ -0,0 +1,51 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  cmake,
+  with_pkgconf? false,
+}:
+
+let
+  meta =  with lib; {
+    description = "Reliable, high-performance, thread safe, flexible, clear-model, pure C logging library";
+    homepage = "https://hardysimpson.github.io/zlog/";
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ matthiasbeyer ];
+    mainProgram = "zlog-chk-conf";
+    platforms = lib.platforms.unix;
+  };
+  pname = "zlog";
+  version = "1.2.18";
+in
+stdenv.mkDerivation (finalAttrs: {
+  pname = pname;
+  version = version;
+                 
+  src = fetchFromGitHub {
+    owner = "HardySimpson";
+    repo = "zlog";
+    tag = finalAttrs.version;
+    hash = "sha256-79yyOGKgqUR1KI2+ngZd7jfVcz4Dw1IxaYfBJyjsxYc=";
+  };
+
+  nativeBuildInputs = [ cmake ];
+
+  postInstall = ''
+    mkdir -p $out/lib/pkgconfig
+    cat >$out/lib/pkgconfig/zlog.pc <<EOF
+    prefix=$out
+    exec_prefix=\''${prefix}
+    libdir=$out/lib
+    includedir=\''${prefix}/include
+
+    Name: ${pname}
+    Description: ${meta.description}
+    Version: ${version}
+    Libs: -L\''${libdir} -lzlog
+    Cflags: -I\''${includedir}
+    EOF
+  '';
+  
+  inherit meta;
+})