diff --git a/flake.nix b/flake.nix
index d014baf..6f8f727 100644
--- a/flake.nix
+++ b/flake.nix
@@ -25,8 +25,6 @@
                   trellis,
                   which,
                   yosys,
-                  TOPMODULE ? "mkTop",
-                  makeFlags ? [ ],
                 }:
                 stdenv.mkDerivation {
                   pname = "riscv-bluespec-classic";
@@ -34,7 +32,7 @@
                   src = ./.;
 
                   # Versions can be checked with
-                  # `nix eval --json ".#bluespec-joh-template.nativeBuildInputs" | nix-shell -p jq --run jq`
+                  # `nix eval --json ".#riscv-bluespec-classic.nativeBuildInputs" | nix-shell -p jq --run jq`
                   nativeBuildInputs = [
                     bluespec
                     nextpnr
@@ -44,7 +42,18 @@
                     yosys
                   ];
 
-                  # TODO: Build and install something
+                  makeFlags = [
+                    "fpga"
+                  ];
+
+                  installPhase = ''
+                    runHook preInstall
+
+                    mkdir -p "$out"
+                    cp "./ulx3s_fpga/mkTop.bit" "$out/"
+
+                    runHook postInstall
+                  '';
 
                 }
               ) { };