bug#66352: parallel make yields "find: ‘./conf*.dir’: No such file or directory" errors

[Vincent Lefevre]

When I want to build Automake (current Git version) with
a parallel make ("make -j12"):

  MAKEINFO doc/automake-history.info
  GEN      bin/automake
  GEN      bin/aclocal
  GEN      t/ax/shell-no-trail-bslash
  GEN      t/ax/cc-no-c-o
  GEN      doc/aclocal.1
  GEN      runtest
  GEN      doc/automake.1
  GEN      doc/amhello-1.0.tar.gz
make[1]: Entering directory '/home/vlefevre/software/automake'
  GEN      lib/Automake/Config.pm
  GEN      t/ax/test-defs.sh
find: ‘./conf272281.dir’: No such file or directory
find: ‘./conf272280.dir’: No such file or directory
find: ‘./conf272301.dir’: No such file or directory
make[1]: Leaving directory '/home/vlefevre/software/automake'
Updating ./doc/version.texi
  MAKEINFO doc/automake.info
  GEN      bin/aclocal-1.16
  GEN      doc/aclocal-1.16.1
  GEN      bin/automake-1.16
  GEN      doc/automake-1.16.1
+++++++++++make: INTERNAL: Exiting with 1 jobserver tokens available; should be 
12!

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Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)