use precompiled doc from tarball
--- a/meson.build
+++ b/meson.build
@@ -148,7 +148,7 @@ conf.set_quoted('APP_VERSION', version)
 configure_file(output: 'buildconf.hpp', configuration: conf)
 
 # doc generator
-python3 = find_program('python3', native: true, required: false)
+python3 = find_program('python3', native: true, required: false, disabler: true)
 if python3.found()
     extra_dir = meson.global_source_root() / 'extra'
     # man 1