METIS & GKlib via FetchContent

Author: scivision

.gitmodules

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.19...4.3)
+cmake_minimum_required(VERSION 3.21...4.3)
 
 if(NOT CMAKE_BUILD_TYPE AND NOT DEFINED ENV{CMAKE_BUILD_TYPE})
   set(CMAKE_BUILD_TYPE Release CACHE STRING "Debug or Release")
@@ -8,16 +8,17 @@ project(parmetis LANGUAGES C VERSION 1.0.0)
 
 # --- need METIS first
 include(GNUInstallDirs)
-include(cmake/GitSubmodule.cmake)
+include(FetchContent)
 
 if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT AND parmetis_IS_TOP_LEVEL)
   set(CMAKE_INSTALL_PREFIX "${PROJECT_BINARY_DIR}/local" CACHE PATH "install prefix" FORCE)
 endif()
 
 message(STATUS "${PROJECT_NAME} ${PROJECT_VERSION} CMake ${CMAKE_VERSION} install prefix ${CMAKE_INSTALL_PREFIX}")
 
-git_submodule(${CMAKE_CURRENT_SOURCE_DIR}/METIS)
-add_subdirectory(METIS)
+set(metis_url "https://github.com/scivision/METIS/archive/777472ae3cd15a8e6d1e5b7d6c347d21947e3ab2.tar.gz")
+FetchContent_Declare(metis URL ${metis_url})
+FetchContent_MakeAvailable(metis)
 
 set(CMAKE_C_STANDARD 99)