PCRE ("Perl Compatible Regular Expressions") is a required dependency for libguestfs, guestfs-tools and virt-v2v. We use it extensively throughout the code for regular expression stuff, and even maintain our own OCaml bindings. The original PCRE (v1) was deprecated upstream a few years ago. It's now only maintained for critical bugs. Therefore I have migrated everything over to PCRE2 -- quite a significant change actually. So you'll need to adjust your dependencies accordingly. PCRE2 seems to be as widely available as PCRE (v1) so this shouldn't be a problem, although let me know if it causes any issues. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org