Pcre++ is missing from portage
"PCRE++ is a C++ wrapper-class for the great library PCRE. (Perl Compatible Regular Expressions), which is available on External Link http://www.pcre.org/ by Philip Hazel.
It class allows you to use perl alike regular expressions in your C++ applications. You can use it to search in strings, to split strings into parts using expressions or to search and replace a part of a string with another part."
Actually.. don't bother, it turns out to be rather broken
Broken? WONTFIX then.