parallel buildworld breakage

[Don Lewis]

I just got this failure during a make -j12 buildworld on head r280837.

--- realinstall ---
sh /usr/src/tools/install.sh -o root -g wheel -m 444  crtbegin.o /usr/obj/usr/src/tmp/usr/lib/crtbegin.o
sh /usr/src/tools/install.sh -o root -g wheel -m 444  crtend.o /usr/obj/usr/src/tmp/usr/lib/crtend.o
sh /usr/src/tools/install.sh -o root -g wheel -m 444  crtbeginT.o /usr/obj/usr/src/tmp/usr/lib/crtbeginT.o
sh /usr/src/tools/install.sh -o root -g wheel -m 444  crtbeginS.o /usr/obj/usr/src/tmp/usr/lib/crtbeginS.o
sh /usr/src/tools/install.sh -o root -g wheel -m 444  crtendS.o /usr/obj/usr/src/tmp/usr/lib/crtendS.o
--- lib/libc__L ---
/usr/src/lib/libc/net/nslexer.l:47:10: fatal error: 'nsparser.h' file not found
#include "nsparser.h"
         ^
1 error generated.
mkdep: compile failed
*** [.depend] Error code 1


I don't see any recent commits that look suspicious.

Starting a single-threaded buildworld now ...