+ ,@(if (hurd-target?)
+ ;; The build system refuses to cross-compile for unknown targets
+ ;; even though it works fine. Add GNU/Hurd target.
+ ;; TODO: Make it a patch in a future rebuild cycle.
+ '((add-before 'configure 'support-hurd-cross-compile
+ (lambda _
+ (substitute* "configure"
+ (("\\*-\\*-vxworks.*" all)
+ (string-append "*-*-gnu)\nac_sys_system=GNU\n;;\n" all)))
+ #t)))
+ '())