#56005 "write_wait_fd: unimplemented" error from 'guix substitute'

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From: Maxime Devos <maximedevos@telenet.be>
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 Content preview: retitle 56005 during substitution: write_wait_fd:
 unimplemented thanks 
 Content analysis details:   (3.7 points, 10.0 required)
 pts rule name              description
 ---- ---------------------- --------------------------------------------------
 -0.0 SPF_PASS               SPF: sender matches SPF record
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 Content preview:  retitle 56005 during substitution: write_wait_fd: unimplemented
    thanks 
 
 Content analysis details:   (2.7 points, 10.0 required)
 
  pts rule name              description
 ---- ---------------------- --------------------------------------------------
 -0.0 SPF_PASS               SPF: sender matches SPF record
  0.0 SPF_HELO_NONE          SPF: HELO does not publish an SPF Record
  0.0 FREEMAIL_FROM          Sender email is commonly abused enduser mail
                             provider (maximedevos[at]telenet.be)
  0.0 TVD_SPACE_RATIO        No description available.
  2.0 BLANK_SUBJECT          Subject is present but empty
 -0.0 T_SCC_BODY_TEXT_LINE   No description available.
 -1.0 MAILING_LIST_MULTI     Multiple indicators imply a widely-seen list
                             manager
  1.7 BODY_EMPTY             No body text in message