using .a files instead of prebuilt cpp files (.o files)

[TymekBrunka]

So I wanted to try out embeding luau and succeded with easy way (including subdirectory and depending on luau vm and compiler)
but it was kind of slow for quick rebuilding and if I were to make a game it could take longer to compile whole project.

And because of that i whould like to ask how to depend on luau vm and compiler as .a files instead of their prebuilt cpp form.

My attempt so far

cmake_minimum_required(VERSION 3.0)
project(gex LANGUAGES CXX C)

include(ExternalProject)

# Define the Luau library as an external project
ExternalProject_Add(
    LuauExternal
    SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/luau
    # CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
    # BUILD_COMMAND ""
    # INSTALL_COMMAND ""
)
if(CMAKE_GENERATOR MATCHES "Makefiles")
    # Re-enable install step for non-Makefile generators
    add_custom_target(build_luau
        COMMAND make
        DEPENDS LuauExternal
    )
endif()

# Specify the locations of the Luau library components
set(Luau_INCLUDE_DIRS
    ${CMAKE_CURRENT_SOURCE_DIR}/luau/VM/include
    ${CMAKE_CURRENT_SOURCE_DIR}/luau/Compiler/include
    CACHE PATH "Paths to Luau include directories"
)

set(Luau_LIBRARIES
    ${CMAKE_CURRENT_BINARY_DIR}/luau/libLuau.VM.a
    ${CMAKE_CURRENT_BINARY_DIR}/luau/libLuau.Compiler.a
    CACHE PATH "Paths to Luau static libraries"
)

# Add Luau as a dependency to your main project
add_executable(gex main.cpp)

# Include Luau headers from multiple directories
foreach(INCLUDE_DIR ${Luau_INCLUDE_DIRS})
    target_include_directories(gex PUBLIC ${INCLUDE_DIR})
endforeach()

# Link Luau static libraries from multiple directories
target_link_libraries(gex ${Luau_LIBRARIES})

error form cmake .. && make

[ 10%] Performing install step for 'LuauExternal'
cd /home/tymek/Documents/embeding-luau/build/LuauExternal-prefix/src/LuauExternal-build && make install
make[3]: *** No rules defined for  'install' object. Stop.

^- it does it after buildig Luau.