http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/dev-libs/poco/files/poco-1.4.4-patch-for-libpcre-8.32.patch

we do not want to mix system pcre with bundled pcre, but we have to,
as poco uses internal interfaces.

--- Foundation/Makefile.orig	Tue Mar 19 21:02:36 2013
+++ Foundation/Makefile	Tue Mar 19 21:09:05 2013
@@ -44,6 +44,7 @@ pcre_utf8_objects = pcre_ucd pcre_tables
 
 ifdef POCO_UNBUNDLED
 	SYSLIBS += -lpcre -lz
+	objects += $(pcre_utf8_objects) # unicode.cpp uses internal pcre tables
 else
 	objects += $(zlib_objects) $(pcre_objects) $(pcre_utf8_objects)
 endif