diff --git a/apps/twnlua/CMakeLists.txt b/apps/twnlua/CMakeLists.txt
index 9dae665..2bd46d7 100644
--- a/apps/twnlua/CMakeLists.txt
+++ b/apps/twnlua/CMakeLists.txt
@@ -2,6 +2,8 @@ cmake_minimum_required(VERSION 3.21)
 cmake_policy(SET CMP0171 NEW)
 project(twnlua LANGUAGES C)
 
+option(TWN_OUT_DIR "Artifact destination" ${CMAKE_SOURCE_DIR})
+
 if(NOT CMAKE_BUILD_TYPE)
         set(CMAKE_BUILD_TYPE Debug)
 endif()
@@ -39,5 +41,5 @@ set(SOURCE_FILES
         ${CMAKE_CURRENT_SOURCE_DIR}/luabind.c
 )
 
-cmake_path(GET CMAKE_SOURCE_DIR STEM LAST_ONLY GAME_PROJECT_NAME)
-use_townengine(${GAME_PROJECT_NAME} "${SOURCE_FILES}" ${CMAKE_SOURCE_DIR})
+cmake_path(GET TWN_OUT_DIR STEM LAST_ONLY GAME_PROJECT_NAME)
+use_townengine(${GAME_PROJECT_NAME} "${SOURCE_FILES}" ${TWN_OUT_DIR})
diff --git a/bin/twnbuild b/bin/twnbuild
index e53c2b7..b2898cf 100755
--- a/bin/twnbuild
+++ b/bin/twnbuild
@@ -24,7 +24,7 @@ if "--release" in argv:
     cmake += ["-DCMAKE_BUILD_TYPE=Release"]
 # pass arbitrary arguments over
 if "--" in argv:
-    cmake += argv[argv.find("--"):]
+    cmake += argv[argv.index("--")+1:]
 
 # if no root cmake file is present, infer it from `twn.toml:game.interpreter`
 if not Path("CMakeLists.txt").is_file():