add shell.nix

.envrc

@@ -0,0 +1 @@
+use nix

shell.nix

@@ -0,0 +1,11 @@
+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {
+    nativeBuildInputs = [ pkgs.pkg-config pkgs.openssl pkgs.libgcc pkgs.boost pkgs.cmake ];
+
+    shellHook = ''
+      export OPENSSL_DIR="${pkgs.openssl.dev}"
+      export PKG_CONFIG_PATH="${pkgs.openssl.dev}/lib/pkgconfig"
+      export OPENSSL_NO_VENDOR=1
+export OPENSSL_LIB_DIR="${pkgs.lib.getLib pkgs.openssl}/lib"
+    '';
+}

src/api_main.cpp

@@ -7,6 +7,7 @@
 #include <sstream>
 #include <unordered_map>
 #include <vector>
+#include <span>
 
 using namespace anthracite;