The source tarball download fails on 2.5.33. Modifying SRC_URI to mirror://sourceforge/flex/${P}.tar.bz2 solved the issue.
Created attachment 80571 [details, diff] Patch to use appropriate SourceForge project Appearently flex has two nearly identical projects on SourceForge. They have released the file on "flex" but not on "lex" (still on 2.5.31).
in cvs, thanks