pkgconf is described as 'API-driven pkg-config replacement' and is an app in the news & books category. There are 2 alternatives to pkgconf for Linux, Mac and Windows. The best pkgconf alternative is u-config, which is both free and Open Source.
u-config ("micro-config") is a small, highly portable pkg-config and pkgconf clone. It was written primarily for w64devkit and Windows, but can also serve as a reliable drop-in replacement on other platforms. Notable features:
pkg-config is computer software that provides a unified interface for querying installed libraries for the purpose of compiling software from its source code.