First drop the game's core mechanic that compiles.

meson.build

@@ -0,0 +1,26 @@
+project('lcppthw', 'cpp',
+    default_options: ['cpp_std=c++20'])
+
+cmake = import('cmake')
+opts = cmake.subproject_options()
+opts.add_cmake_defines({
+  'USE_ICONV': false,
+  'USE_SSH': false,
+  'USE_NTLMCLIENT': false,
+  'BUILD_SHARED_LIBS': true,
+  'BUILD_TESTS': false,
+  })
+libgit2_proj = cmake.subproject('libgit2', options: opts)
+libgit2package_dep = libgit2_proj.dependency('libgit2package')
+
+efsw_proj = cmake.subproject('efsw')
+efsw_dep = efsw_proj.dependency('efsw')
+
+fmt = dependency('fmt')
+
+dependencies = [
+  fmt, libgit2package_dep, efsw_dep,
+]
+
+executable('watchgit', 'watchgit.cpp',
+  dependencies: dependencies)