Sergei Trofimovich <slyfox@inbox.ru> writes:

> Parallel build failure was fixed upstream as:
> https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=e8b6be0016f131c2ac72bf3213eabdb59800e63b
>
> gnu/packages/base.scm (glibc/linux): reenable parallel builds
>
> Signed-off-by: Sergei Trofimovich <slyfox@inbox.ru>
> ---
>  gnu/packages/base.scm | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/gnu/packages/base.scm b/gnu/packages/base.scm
> index 5c36b612f..79733b14f 100644
> --- a/gnu/packages/base.scm
> +++ b/gnu/packages/base.scm
> @@ -563,10 +563,6 @@ store.")
>     (arguments
>      `(#:out-of-source? #t
>  
> -      ;; In version 2.21, there a race in the 'elf' directory, see
> -      ;; <http://lists.gnu.org/archive/html/guix-devel/2015-02/msg00709.html>.
> -      #:parallel-build? #f
> -
>        ;; The libraries have an empty RUNPATH, but some, such as the versioned
>        ;; libraries (libdl-2.24.so, etc.) have ld.so marked as NEEDED.  Since
>        ;; these libraries are always going to be found anyway, just skip

This works fine for me, but I'll wait for a second opinion in case I
missed something.