maintainer-feedback requested: [Bug 253614] security/nss: apparently needs MAKE_JOBS_UNSAFE

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-gecko (Nobody)
<gecko at FreeBSD.org> for maintainer-feedback:
Bug 253614: security/nss: apparently needs MAKE_JOBS_UNSAFE
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253614



--- Description ---
Had this error twice out of two attempts when trying to build security/nss on
stable/13:

../../coreconf/nsinstall/FreeBSD13.0_OPT.OBJ/nsinstall -R -m 444 nssckt.h
../../../dist/public/nss
symlink creation race:
/wrkdirs/usr/ports/security/nss/work/nss-3.61/dist/public/nss/nssckfwc.h
nsinstall: symlink was attempted in working directory
/wrkdirs/usr/ports/security/nss/work/nss-3.61/nss/lib/ckfw from
../../../nss/lib/ckfw/nssckfwc.h to
/wrkdirs/usr/ports/security/nss/work/nss-3.61/dist/public/nss/nssckfwc.h.
: File exists
../../coreconf/nsinstall/FreeBSD13.0_OPT.OBJ/nsinstall -R -m 444 nssckt.h
../../../dist/public/nss
gmake[5]: *** [../../coreconf/rules.mk:387:
../../../dist/public/nss/nssckfwc.h] Abort trap (core dumped)
gmake[5]: *** Deleting file '../../../dist/public/nss/nssckfwc.h'

Manually setting MAKE_JOBS_UNSAFE allowed the build to succeed.