diff --git a/packages/mtxclient-git.nix b/packages/mtxclient-git.nix
new file mode 100644
index 0000000..2392312
--- /dev/null
+++ b/packages/mtxclient-git.nix
@@ -0,0 +1,65 @@
+# This file was copied from NUR: https://github.com/nix-community/nur-combined/blob/master/repos/deeunderscore/pkgs/mtxclient/default.nix
+# This file is a modified version of nixpkgs/pkgs/development/libraries/mtxclient/default.nix (copied at 5c4b9be)
+
+{
+ lib,
+ stdenv,
+ fetchFromGitHub,
+ cmake,
+ pkg-config,
+ openssl,
+ olm,
+ spdlog,
+ nlohmann_json,
+ libevent,
+ curl,
+ coeurl,
+ re2,
+ mtxclientSrc,
+}:
+stdenv.mkDerivation {
+ pname = "mtxclient";
+ version = "git+master";
+ src = mtxclientSrc;
+
+ cmakeFlags = [
+ # Network requiring tests can't be disabled individually:
+ # https://github.com/Nheko-Reborn/mtxclient/issues/22
+ "-DBUILD_LIB_TESTS=OFF"
+ "-DBUILD_LIB_EXAMPLES=OFF"
+ ];
+
+ postPatch = ''
+ # See https://github.com/gabime/spdlog/issues/1897
+ sed -i '1a add_compile_definitions(SPDLOG_FMT_EXTERNAL)' CMakeLists.txt
+ '';
+
+ nativeBuildInputs = [
+ cmake
+ pkg-config
+ ];
+ buildInputs = [
+ spdlog
+ nlohmann_json
+ openssl
+ olm
+ libevent
+ curl
+ coeurl
+ re2
+ ];
+
+ meta = with lib; {
+ description = "Client API library for Matrix, built on top of Boost.Asio";
+ homepage = "https://github.com/Nheko-Reborn/mtxclient";
+ license = licenses.mit;
+ maintainers = with maintainers; [
+ fpletz
+ pstn
+ ];
+ platforms = platforms.all;
+ # Should be fixable if a higher clang version is used, see:
+ # https://github.com/NixOS/nixpkgs/pull/85922#issuecomment-619287177
+ broken = stdenv.targetPlatform.isDarwin;
+ };
+}
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