It's been a long time that the gcc libraries are all installed in the sys-root.
Thus populate does not need to look above to find the libraries.

/trunk/tools/populate.in | 9 3 6 0 +++------
1 file changed, 3 insertions(+), 6 deletions(-)

# Compute x86_64-specific values

CT_DoArchValues() {

    # The architecture part of the tuple:

    CT_TARGET_ARCH="${CT_ARCH}"

}