If this is not done then pkg-config can get confused.
Thomas and Arnout really deserve the credit for this - I just did
the testing.
Signed-off-by: Charles Manning <cdhmanning@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
# Make sure pkg-config doesn't look outside the buildroot tree
unexport PKG_CONFIG_PATH
+unexport PKG_CONFIG_SYSROOT_DIR
# Having DESTDIR set in the environment confuses the installation
# steps of some packages.