I made a patch for the libpcre ebuild to honor the 'unicode' USE flag. I'll attach the patch.
Created attachment 92782 [details, diff] patch to honor 'unicode' USE flag
Fixed in version 7, thanks for the patch.
Would it be possible to apply this patch to 6.6 please? 7.0 is keyworded only ~x86, so Unicode character properties isn't available to x86 or amd64 yet.