pkg/54604: Unable to compile strace (pkgsrc) on -CURRENT

[rares.aioanei%gmail.com@localhost]

>Number:         54604
>Category:       pkg
>Synopsis:       Unable to compile strace (pkgsrc) on -CURRENT
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 06 13:20:00 +0000 2019
>Originator:     Rares
>Release:        CURRENT
>Organization:
>Environment:
NetBSD localhost 9.99.15 NetBSD 9.99.15 (GENERIC) #0: Fri Oct  4 16:27:00 UTC 2019  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
localhost$ cd /usr/pkgsrc/sysutils/strace/
localhost$ sudo make install clean
=> Bootstrap dependency digest>=20010302: found digest-20190127
===> Building for strace-4.5.15nb13
cd netbsd && make
/usr/bin/make  all-am
if gcc -DHAVE_CONFIG_H -I. -I. -I. -Inetbsd/x86_64 -I./netbsd/x86_64 -Inetbsd -I./netbsd    -Wall -O2 -D_FORTIFY_SOURCE=2 -MT sock.o -MD -MP -MF ".deps/sock.Tpo" -c -o sock.o sock.c;  then mv -f ".deps/sock.Tpo" ".deps/sock.Po"; else rm -f ".deps/sock.Tpo"; exit 1; fi
sock.c:58:4: error: 'IFF_NOTRAILERS' undeclared here (not in a function); did you mean 'ATF_USETRAILERS'?
  { IFF_NOTRAILERS, "IFF_NOTRAILERS" },
    ^~~~~~~~~~~~~~
    ATF_USETRAILERS
sock.c:52:26: warning: 'iffflags' defined but not used [-Wunused-const-variable=]
 static const struct xlat iffflags[] = {
                          ^~~~~~~~
*** Error code 1

Stop.
make[1]: stopped in /usr/pkgsrc/sysutils/strace/work/strace-4.5.15
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/sysutils/strace/work/strace-4.5.15
*** Error code 1

Stop.
make[1]: stopped in /usr/pkgsrc/sysutils/strace
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/sysutils/strace

>How-To-Repeat:
Try to compile strace on up-to-date -CURRENT from pkgsrc
>Fix: