make buildworld failure

[R. E. Ceiver]

I encountered exactly the same error while doing a "make buildworld"
overnight. The machine is a Pentium MMX, 146 MHz. If more infos are
required, drop me a mail.
--markus

===> share/doc/papers/memfs
indxbib -c 
/usr/src/share/doc/papers/memfs/../../../../contrib/groff/src/utils/indxbib/eign 
 -o ref.bib /usr/src/share/doc/papers/memfs/ref.bib
vgrind -f < /usr/src/share/doc/papers/memfs/A.t > A.gt
refer -n -e -l -s -p /usr/src/share/doc/papers/memfs/ref.bib 
/usr/src/share/doc/papers/memfs/0.t /usr/src/share/doc/papers/memfs/1.t 
A.gt > paper.t
refer:/usr/src/share/doc/papers/memfs//1.t:46:fatal error: cannot create 
temporary file: No such file or directory
*** Error code 3

Stop in /usr/src/share/doc/papers/memfs.
*** Error code 1
Stop in /usr/src/share/doc/papers.
*** Error code 1
Stop in /usr/src/share/doc.
*** Error code 1
Stop in /usr/src/share.
*** Error code 1
Stop in /usr/src.
*** Error code 1
Stop in /usr/src.
*** Error code 1
Stop in /usr/src.
#