r343663 poudriere can not configure pkg

[Graham Perrin]

 From <https://pastebin.com/Px6MUmzk>:

…
=======================<phase: configure >============================
===>  Configuring for pkg-1.10.5_5
configure: loading site script /usr/ports/Templates/config.site
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... (cached) /bin/mkdir -p
checking for gawk... (cached) /usr/bin/awk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking for style of include used by make... GNU
checking for gcc... cc
checking whether the C compiler works... no
configure: error: in `/wrkdirs/usr/ports/ports-mgmt/pkg/work/pkg-1.10.5':
configure: error: C compiler cannot create executables
See `config.log' for more details
===>  Script "configure" failed unexpectedly.
Please report the problem to pkg at FreeBSD.org [maintainer] and attach the
"/wrkdirs/usr/ports/ports-mgmt/pkg/work/pkg-1.10.5/config.log" including the
output of the failure of your make command. Also, it might be a good idea to
provide an overview of all packages installed on your system (e.g. a
/wrkdirs/usr/ports/ports-mgmt/pkg/work/pkg-1.10.5/src/pkg-static info -g 
-Ea).
*** Error code 1

Stop.
make[1]: stopped in /usr/ports/ports-mgmt/pkg
*** Error code 1

Stop.
make: stopped in /usr/ports/ports-mgmt/pkg
=>> Cleaning up wrkdir
===>  Cleaning for pkg-1.10.5_5
build of ports-mgmt/pkg | pkg-1.10.5_5 ended at Sat Feb  2 04:52:38 GMT 2019
build time: 00:00:01
!!! build failure encountered !!!