flake.nix: Support Nixpkgs 19.09

5f75d56c · Eelco Dolstra · bf0b7e54 · 5f75d56c
Commit 5f75d56c authored 4 years ago by Eelco Dolstra
--- a/flake.nix
+++ b/flake.nix
@@ -76,6 +76,9 @@
            openssl pkgconfig sqlite
            libarchive
            boost
+            (if lib.versionAtLeast lib.version "20.03pre"
+             then nlohmann_json
+             else nlohmann_json.override { multipleHeaders = true; })
            nlohmann_json
            rustc cargo