Add an initial build system test

.clang-format

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+BasedOnStyle: LLVM
+IndentWidth: 4

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4

.envrc

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+use flake

.gitignore

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+.cache
+.direnv
+build

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1724300212,
+        "narHash": "sha256-x3jl6OWTs+L9C7EtscuWZmGZWI0iSBDafvg3X7JMa1A=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "4de4818c1ffa76d57787af936e8a23648bda6be4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      inherit (nixpkgs) lib;
+      makePkgs = system: import nixpkgs { inherit system; };
+      forAllSystems = f: lib.genAttrs lib.systems.flakeExposed (system: f (makePkgs system));
+    in
+    {
+      formatter = forAllSystems (pkgs: pkgs.nixfmt-rfc-style);
+
+      devShells = forAllSystems (pkgs: {
+        default = (pkgs.mkShell.override { stdenv = pkgs.llvmPackages.stdenv; }) {
+          packages = with pkgs; [
+            meson
+            ninja
+            pkg-config
+
+            boost
+            curl
+          ];
+        };
+      });
+    };
+}

meson.build

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+project('vapore', 'cpp',
+  default_options : [
+    'cpp_std=c++20',
+    'optimization=2',
+    'debug=true',
+  ],
+)
+
+curl = dependency('libcurl', 'curl', required : true)
+
+tool = executable('vaporetool', 'src/tool/main.cpp', dependencies: [ curl ])

src/tool/main.cpp

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+#include <iostream>
+#include <memory>
+#include <mutex>
+#include <stdexcept>
+#include <string>
+
+#include <curl/curl.h>
+
+namespace vapore {
+void initCurl() {
+    static std::once_flag globalInit;
+    std::call_once(globalInit, curl_global_init, CURL_GLOBAL_DEFAULT);
+}
+
+int wrappedMain(int argc, char **argv) {
+    initCurl();
+
+    auto curl = std::unique_ptr<CURL, decltype(&curl_easy_cleanup)>(
+        curl_easy_init(), curl_easy_cleanup);
+
+    if (curl.get() == nullptr) {
+        throw std::runtime_error("Could not create curl_easy");
+    }
+
+    curl_easy_setopt(curl.get(), CURLOPT_URL, "https://example.com");
+    curl_easy_perform(curl.get());
+
+    return 0;
+}
+} // namespace vapore
+
+int main(int argc, char **argv) {
+    try {
+        return vapore::wrappedMain(argc, argv);
+    } catch (std::exception &ex) {
+        std::cerr << std::string("Got exception: ") << ex.what() << std::endl;
+    }
+}