If this isn't set, pkg-config will use its inbuilt paths which mean it can
end up looking in the native sysroot.
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
export PKG_CONFIG_DIR = "${STAGING_DIR}/${BASE_PACKAGE_ARCH}${TARGET_VENDOR}-${TARGET_OS}${libdir}/pkgconfig"
export PKG_CONFIG_PATH = "${PKG_CONFIG_DIR}:${STAGING_DATADIR}/pkgconfig"
+export PKG_CONFIG_LIBDIR = "${PKG_CONFIG_DIR}"
export PKG_CONFIG_SYSROOT_DIR = "${STAGING_DIR}/${BASE_PACKAGE_ARCH}${TARGET_VENDOR}-${TARGET_OS}"
export PKG_CONFIG_DISABLE_UNINSTALLED = "yes"