Restarted the production of the app

libs/CLI11/meson.build

@@ -0,0 +1,23 @@
+project('CLI11', ['cpp'],
+  version         : run_command(find_program('scripts/ExtractVersion.py'), check: true).stdout().strip(),
+  default_options : ['cpp_std=c++11', 'warning_level=3']
+)
+
+cxx = meson.get_compiler('cpp')
+
+CLI11_inc = include_directories(['include'])
+
+CLI11_dep = declare_dependency(
+  include_directories : CLI11_inc,
+  version             : meson.project_version(),
+)
+
+if get_option('tests')
+    warnings = ['-Wshadow', '-Wsign-conversion', '-Wswitch-enum']
+    if cxx.get_id() == 'gcc' and cxx.version().version_compare('>=4.9')
+        warnings += '-Weffc++'
+    endif
+    add_project_arguments(cxx.get_supported_arguments(warnings), language: 'cpp')
+
+    subdir('tests')
+endif