http://bugs.winehq.org/show_bug.cgi?id=21288
--- Comment #9 from Todd Chester ToddAndMargo@verizon.net 2010-01-10 17:09:37 --- Came up with a workaround. Fedora Core 7's flex RPM installs in CentOS 5.4 without problem. Got mine from:
ftp://ftp.pbone.net/mirror/archive.fedoraproject.org/fedora/linux/updates/7/i386/flex-2.5.33-9.fc7.i386.rpm
Filed a request at Red Hat for flex 2.5.33 https://bugzilla.redhat.com/show_bug.cgi?id=554210