FYI: x11/xscreensaver appears to have a build-race

[Mark Millard]

I ran two separate devel/poudriere-devel amd64->aarch64
cross builds on the same system (head -r 351178 based)
with the same /usr/ports/ tree (ports head -r509171),
building the same 97 ports each, mostly overlapping
in time, and one got:

gmake[2]: *** [Makefile:37: gen/apple_png.h] Error 2

while building x11/xscreensaver but the other 
completed building x11/xscreensaver just fine.

There was also a armv7-targeting poudriere-devel ports
update running, also mostly overlapping in time. With
28 FreeBSD CPUs (under Hyper-V), the load average was
frequently over 90. (The armv7 x11/xscreensaver build
also completed fine.)

All 3 poudriere's had ALLOW_MAKE_JOBS=yes and all 3 set
up to have "Building 97 packages using 28 builders".
devel/llvm90 was one of the ports being built. All 3
poudriere's had native-xtools in use. The context has
ECC DRAM, 96 GiBytes worth.

===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)