pkg/51646: x11/modular-xorg-server fails to configure

[Hauke Fath <hf%spg.tu-darmstadt.de@localhost>]

	Note: There was a bad value `medium' for the field `Severity'.
	It was set to the default value of `serious'.

>Number:         51646
>Category:       pkg
>Synopsis:       x11/modular-xorg-server fails to configure
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Nov 23 12:40:00 +0000 2016
>Originator:     Hauke Fath
>Release:        NetBSD 7.99.42
>Organization:
Technische Universitaet Darmstadt
>Environment:
	
	
System: NetBSD Anscharte.nt.e-technik.tu-darmstadt.de 7.99.42 NetBSD 7.99.42 (HP2170P) #0: Wed Nov 16 17:23:21 CET 2016 hauke%Anscharte.nt.e-technik.tu-darmstadt.de@localhost:/var/obj/netbsd-builds/developer/amd64/sys/arch/amd64/compile/HP2170P amd64
Architecture: x86_64
Machine: amd64
>Description:

	On -current, after the recent update to 1.19.0 the
	x11/modular-xorg-server build fails in configure phase with

[...]
checking for socklen_t... yes
checking for struct msghdr.msg_control... yes
checking if Xtrans should support os-specific local connections... no
checking for authdes_seccreate... no
checking for authdes_create... no
checking if Secure RPC authentication ("SUN-DES-1") should be supported... no
checking for PIXMAN... yes
checking whether PTHREAD_MUTEX_RECURSIVE is declared... yes
checking if compiler needs -Werror to reject unknown flags... no
configure: error: threaded input requested but no pthread support has been found
*** Error code 1

Stop.
make[1]: stopped in /local/source/pkgsrc/x11/modular-xorg-server
*** Error code 1


	config.log has

[...]
configure:22411: gcc -c -O2 -pipe -Wall -Wno-error -I/usr/include -I/usr/pkg/inc
lude -I/usr/pkg/include/freetype2 -I/usr/pkg/include/libdrm -Werror -Wunknown-wa
rning-option -Wsizeof-array-argument -D_OPENBSD_SOURCE -I/usr/include -I/usr/pkg
/include -I/usr/pkg/include/freetype2 -I/usr/pkg/include/libdrm conftest.c >&5
gcc: error: unrecognized command line option '-Wunknown-warning-option'
[...]

	gcc is

% gcc --version
gcc (nb1 20160606) 5.4.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
%

	
>How-To-Repeat:

	(Try to) build the package on netbsd-current.

	
>Fix:

	Yes, please.

	

>Unformatted: