Parallel make failure with gnutls-3.0.12

[Eli Zaretskii]

> Date: Sat, 21 Jan 2012 20:34:44 +0100
> From: Nikos Mavrogiannopoulos <nmav at gnutls.org>
> Cc: GnuTLS development list <gnutls-devel at gnu.org>
> 
>  Would applying this patch fix the parallel builds in your case?
> [...]
> --- a/doc/Makefile.am
> +++ b/doc/Makefile.am
> @@ -297,6 +297,8 @@ ENUMS += enums/gnutls_x509_subject_alt_name_t
>  gnutls_TEXINFOS += $(ENUMS)
>  DISTCLEANFILES += $(ENUMS)
>  
> +.NOTPARALLEL: $(ENUMS) enums.texi
> +
>  $(ENUMS): enums.texi
>  	$(MAKE) compare-makefile
>  	-mkdir enums

".NOTPARALLEL" is specific to GNU Make.