diff --git a/CMakeLists.txt b/CMakeLists.txt
index 26a0e65..339de8c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,10 @@ option(SANITIZER "ADDRESS or THREAD" "THREAD")
 
 # all targets should link to this to use common compile options
 add_library(nf7_config INTERFACE EXCLUDE_FROM_ALL)
+target_include_directories(nf7_config
+  INTERFACE
+    ${PROJECT_SOURCE_DIR}
+)
 target_compile_options(nf7_config INTERFACE
   $<$<CXX_COMPILER_ID:MSVC>:
     /W4
diff --git a/Dockerfile b/Dockerfile
index a87aa95..ca1eedc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,10 +3,15 @@ FROM debian:unstable-slim
 RUN apt update && apt install -y --no-install-recommends  \
   ca-certificates  \
   cmake  \
+  gcc-13  \
   gdb  \
   git  \
   g++-13  \
   make  \
   && apt -y clean && rm -rf /var/lib/apt/lists/*
 
+RUN  \
+  ln -s /usr/bin/gcc-13 /usr/bin/gcc &&  \
+  ln -s /usr/bin/g++-13 /usr/bin/g++
+
 WORKDIR /repo
diff --git a/iface/CMakeLists.txt b/iface/CMakeLists.txt
index 980a3d7..93794b3 100644
--- a/iface/CMakeLists.txt
+++ b/iface/CMakeLists.txt
@@ -1,7 +1,6 @@
 add_library(nf7_iface)
-target_include_directories(nf7_iface PUBLIC ${PROJECT_SOURCE_DIR})
 target_link_libraries(nf7_iface
-  PRIVATE
+  PUBLIC
     git_hash
     nf7_config
 )
diff --git a/iface/common/future_test.cc b/iface/common/future_test.cc
index 44bafc3..e4f4f6c 100644
--- a/iface/common/future_test.cc
+++ b/iface/common/future_test.cc
@@ -164,7 +164,7 @@ TEST(Future, ThenWhenError) {
   nf7::Future<int32_t> sut {std::make_exception_ptr(nf7::Exception {"hello"})};
 
   auto called = int32_t {0};
-  sut.Then([&](auto& x) { ++called; });
+  sut.Then([&](auto&) { ++called; });
 
   EXPECT_EQ(called, 0);
 }
@@ -181,7 +181,7 @@ TEST(Future, CatchWhenError) {
   nf7::Future<int32_t> sut {std::make_exception_ptr(nf7::Exception {"hello"})};
 
   auto called = int32_t {0};
-  sut.Catch([&](auto& e) { ++called; });
+  sut.Catch([&](auto&) { ++called; });
 
   EXPECT_EQ(called, 1);
 }
diff --git a/iface/env.hh b/iface/env.hh
index b01a7a7..489e726 100644
--- a/iface/env.hh
+++ b/iface/env.hh
@@ -7,5 +7,6 @@
 namespace nf7 {
 
 using Env = Container<subsys::Interface>;
+using SimpleEnv = SimpleContainer<subsys::Interface>;
 
 }  // namespace nf7
diff --git a/thirdparty/CMakeLists.txt b/thirdparty/CMakeLists.txt
index 043729b..8317664 100644
--- a/thirdparty/CMakeLists.txt
+++ b/thirdparty/CMakeLists.txt
@@ -1,5 +1,14 @@
 include(FetchContent)
 
+# ---- luajit (MIT)
+FetchContent_Declare(
+  luajit
+  GIT_REPOSITORY https://github.com/LuaJIT/LuaJIT.git
+  GIT_TAG        8635cbabf3094c4d8bd00578c7d812bea87bb2d3
+)
+FetchContent_Populate(luajit)
+include(luajit.cmake)
+
 # ---- gtest (BSD-3-Clause)
 FetchContent_Declare(
   googletest
diff --git a/thirdparty/luajit.cmake b/thirdparty/luajit.cmake
new file mode 100644
index 0000000..61d81a6
--- /dev/null
+++ b/thirdparty/luajit.cmake
@@ -0,0 +1,56 @@
+set(src "${luajit_SOURCE_DIR}/src")
+if (UNIX)
+  find_program(MAKE make REQUIRED)
+
+  set(lib "${src}/libluajit.a")
+  add_custom_target(luajit-build
+    COMMAND
+      ${MAKE} -j BUILDMODE=static CFLAGS=-fPIC
+
+    WORKING_DIRECTORY "${luajit_SOURCE_DIR}"
+    VERBATIM
+  )
+
+  # To enable assertions, add the following options:
+  #   XCFLAGS="-DLUA_USE_APICHECK -DLUA_USE_ASSERT -Og -g"
+
+elseif (MINGW)
+  find_program(MAKE mingw32-make REQUIRED)
+
+  set(lib "${src}/libluajit.a")
+  add_custom_target(luajit-build
+    COMMAND ${MAKE} -j BUILDMODE=static CFLAGS=-fPIC
+
+    WORKING_DIRECTORY "${luajit_SOURCE_DIR}/src"
+    VERBATIM
+  )
+
+elseif (MSVC)
+  set(lib "${src}/lua51.lib")
+  add_custom_command(
+    OUTPUT "${lib}"
+    COMMAND msvcbuild.bat static
+    DEPENDS "${luajit_BINARY_DIR}/skip_build"
+
+    WORKING_DIRECTORY "${src}"
+    VERBATIM
+  )
+  add_custom_target(luajit-build SOURCES "${lib}")
+
+else()
+  message(ERROR "unknown environment")
+endif()
+
+add_library(luajit-imported STATIC IMPORTED)
+set_target_properties(luajit-imported PROPERTIES
+  IMPORTED_LOCATION "${lib}"
+)
+add_dependencies(luajit-imported luajit-build)
+
+add_library(luajit INTERFACE)
+target_link_libraries(luajit
+  INTERFACE luajit-imported $<$<PLATFORM_ID:Linux>:m>
+)
+target_include_directories(luajit SYSTEM BEFORE
+  INTERFACE "${src}"
+)