pkg/51821: libtasn1-4.9 build fails on NetBSD/i386-7.0_STABLE

[jdbaker%mylinuxisp.com@localhost]

>Number:         51821
>Category:       pkg
>Synopsis:       libtasn1-4.9 build fails on NetBSD/i386-7.0_STABLE
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 11 07:25:00 +0000 2017
>Originator:     John D. Baker
>Release:        NetBSD/i386-7.0_STABLE, pkgsrc-2016Q4 w/libtasn1, gnutls from HEAD
>Organization:
>Environment:
NetBSD verthandi.technoskunk.fur 7.0_STABLE NetBSD 7.0_STABLE (VERTHANDI) #10: Thu Jan  5 08:16:33 CST 2017  sysop%dpe2850b.technoskunk.fur@localhost:/d0/build/netbsd-7/obj/i386/sys/arch/i386/compile/VERTHANDI i386

>Description:
gnutls-3.5.8 is awaiting a pullup to pkgsrc-2016Q4 and requires
libtasn1-4.9 (or later).

Building "security/libtasn1" from HEAD on NetBSD/i386-7.0_STABLE
(7.1_RC1 in all but name) fails as follows:

[...]
--- ASN1.lo ---
  CC       ASN1.lo
ASN1.y: In function '_asn1_yylex':
ASN1.y:578:9: error: array subscript has type 'char' [-Werror=char-subscripts]
         if (!isdigit (string[k]))
         ^
cc1: all warnings being treated as errors
*** [ASN1.lo] Error code 1

make[3]: stopped in /d0/build/pkgsrc/security/libtasn1/work/libtasn1-4.9/lib
1 error
[...]

The failure does not occur on i386-current (7.99.55).
>How-To-Repeat:
See above.
>Fix: