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virtuoso-opensource bundles PCRE and tidy (the HTML parser).  They are not only compiled during the build process, but also end up in the /usr/bin/virtuoso-t binary:

[fweimer@localhost ~]$ strings -a /usr/bin/virtuoso-t | egrep 'PCRE_|see www.w3.org'
HTML Tidy, see www.w3.org
this version of PCRE is not compiled with PCRE_UTF8 support
[fweimer@localhost ~]$ 

At least for PCRE, the system library should be used.

We will investigate this further but experience from SUSE folks (who tried to use the system pcre libs) tells us they got severe runtime problems :/

Closing as CANTFIX based on comment #2