toolchain/50844: Building pkgsrc lang/perl5 failes

[carsten.kunze%arcor.de@localhost]

>Number:         50844
>Category:       toolchain
>Synopsis:       Building pkgsrc lang/perl5 failes
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 24 09:40:00 +0000 2016
>Originator:     Carsten Kunze
>Release:        CURRENT 2016-02-23
>Organization:
>Environment:
amd64 (Currently not logged in)
>Description:
I have installed the latest NetBSD-CURRENT and checked out pkgsrc-CURRENT on a amd64 system.  Building of many packages failes because they depend on perl5 which does not build:

[...]
Checking alignment constraints...
Doubles must be aligned on a how-many-byte boundary? [8]  
Checking how long a character is (in bits)...
What is the length of a character (in bits)? [8n]  
Your system has an unsigned character size of 8n bits, which
is rather unusual (normally it is 8 bits).  Perl likely will not work
correctly on your system, with subtle bugs in various places.
Do you really want to continue? [n]  
*** Error code 1

Stop.
make[3]: stopped in /usr/pkgsrc/lang/perl5

The last CURRENT install and pkgsrc checkout I did on Feb. 20, 2016, then all did build fine (except pkglint...).

Martin Husemann <martin%duskware.de@localhost> assumes a /bin/sh or libc change in CURRENT to be a possible cause for the issue.
>How-To-Repeat:
Install latest NetBSD-CURRENT (on amd64?) and check out latest pkgsrc-CURRENT, then build lang/perl5
>Fix: