On Thu, Feb 22, 2018 at 05:56:21PM +0100, Danny Milosavljevic wrote:
> * gnu/packages/scheme.scm (racket): Update to 6.12.
> [arguments]<#:phases>[patch-/bin/sh]: Add substitution.

> @@ -484,6 +484,9 @@ implementation techniques and as an expository tool.")
>             (lambda _
>               (substitute* "collects/racket/system.rkt"
>                 (("/bin/sh") (which "sh")))
> +             (substitute* "src/racket/src/schpriv.h"
> +               ;; Our gcc version is too old so signbit is not a builtin.
> +               (("MZ_IS_NEG_ZERO") "MZ_IS_NEG_ZEROdisable"))
>               #t)))

Would it make sense to just user a newer version of GCC for Racket?