The latest version of this document lives in the vcpkg repo.
z_vcpkg_setup_pkgconfig_path sets up environment variables to use pkgconfig, such as PKG_CONFIG and PKG_CONFIG_PATH.
The original values are restored with z_vcpkg_restore_pkgconfig_path. BASE_DIRS indicates the base directories to find .pc files; typically ${CURRENT_INSTALLED_DIR}, or ${CURRENT_INSTALLED_DIR}/debug.
z_vcpkg_setup_pkgconfig_path(BASE_DIRS <"${CURRENT_INSTALLED_DIR}" ...>)
# Build process that may transitively invoke pkgconfig
z_vcpkg_restore_pkgconfig_path()