Some changes were made to support glibc found RedHat 7.1. The issue
was to support the symbol versioning, especially the readdir64() function.
This is solved and now a virtualfs package compiled on rh7.0 works
as well on rh7.1, with glibc 2.1 or 2.2.
The ftp site contains new version of glibc for redhat 7.0 and 7.1.
If you had previously updated your glibc, you need to update again
to use virtualfs 1.35.
I have been stucked with this issue for some time now :-)