Feature, Add mysql_fdw extension

nix/ext/mysql_fdw.nix

@@ -0,0 +1,41 @@
+{ lib, stdenv, fetchFromGitHub, postgresql, postgresqlTestHook, testers, libmysqlclient }:
+
+stdenv.mkDerivation ( finalAttrs: {
+  pname = "mysql_fdw";
+  version = "REL-2_9_2"; 
+
+  buildInputs = [ postgresql libmysqlclient ];
+
+  src = fetchFromGitHub {
+    owner = "EnterpriseDB";
+    repo = finalAttrs.pname;
+    rev = "refs/tags/${finalAttrs.version}"; # Tag corresponding to the version
+    sha256 = "sha256-CLnSaV+pv+i/k1RlFmMVMK9hXWQkJvEim/xYghXv2cs=";
+  };
+
+  makeFlags = [
+    "USE_PGXS=1"
+  ];
+
+
+  # can't find .so file on execution
+  installPhase = ''
+    mkdir -p $out/{lib,share/postgresql/extension}
+    
+    cp *${postgresql.dlSuffix}      $out/lib
+    cp *.sql     $out/share/postgresql/extension
+    cp *.control $out/share/postgresql/extension
+
+    # Copy libmariadb.so.3 to the PostgreSQL dynamic extension library
+    cp ${libmysqlclient}/lib/mariadb/libmariadb.so.3 $out/lib/libmysqlclient.so
+  '';
+
+  meta = with lib; {
+    description = "MySQL foreign data wrapper for PostgreSQL";
+    homepage = "https://github.com/EnterpriseDB/mysql_fdw";
+    changelog   = "https://github.com/EnterpriseDB/mysql_fdw/releases/tags/${finalAttrs.version}";
+    maintainers = with maintainers; [ thelazzziest ];
+    inherit (postgresql.meta) platforms;
+    license     = licenses.postgresql;
+  };
+})