Not MAKE_JOBS_SAFE:

  Producing `src/paths.h' from `src/paths.h.in'.
  Producing `src/paths.h' from `src/paths.h.in'.
  [...]
  cmp: src/paths.h.tmp: No such file or directory
  mv: rename src/paths.h.tmp to src/paths.h: No such file or directory

(dholland)