pkg/55313: devel/gdb build attempt in/on aarch64 failed with: "./configure failed for aarch64"

[marklmi26-intf%yahoo.com@localhost]

>Number:         55313
>Category:       pkg
>Synopsis:       devel/gdb build attempt in/on aarch64 failed with: "./configure failed for aarch64"
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu May 28 10:30:00 +0000 2020
>Originator:     Mark Millard
>Release:        pkgsrc HEAD 2020-May-27
>Organization:
>Environment:
NetBSD NBSDRPi4 9.99.64 NetBSD 9.99.64 (GENERIC64) #0: Tue May 26 08:39:27 UTC 2020  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/evbarm/compile/GENERIC64 evbarm aarch64
>Description:
Attempting to build devel/gdb in/on a RPi4 (aarch64) failed with:

checking for mbsrtowcs... configure: error: ./configure failed for aarch64
yes
gmake[1]: *** [Makefile:8203: configure-sim] Error 1
gmake[1]: *** Waiting for unfinished jobs....

This was on a NetBSD installed via https://www.armbsd.org/arm/HEAD/202005272200Z/NetBSD-evbarm-aarch64-202005260840Z-generic.img.gz .

>How-To-Repeat:
cd /usr/pkgsrc/devel/gdb
make fetch-list | sh
MAKE_JOBS=4 make

>Fix: