meson/docs/markdown/snippets/config-tool-variable-method.md

Config-Tool based dependencies gained a method to get arbitrary options

A number of dependencies (CUPS, LLVM, pcap, WxWidgets, GnuStep) use a config tool instead of pkg-config. As of this version they now have a get_configtool_variable method, which is analogous to the get_pkgconfig_variable for pkg config.

dep_llvm = dependency('LLVM')
llvm_inc_dir = dep_llvm.get_configtool_variable('includedir')