DECC$POPEN_NO_CRLF_REC_ATTR

   With DECC$POPEN_NO_CRLF_REC_ATTR disabled, a pipe opened with the
   popen function has its record attributes set to CR/LF carriage
   control (fab$b_rat |= FAB$M_CR). This is the default behavior.

   With DECC$POPEN_NO_CRLF_REC_ATTR enabled, CR/LF carriage control
   is prevented from being added to the pipe records. This is
   compatible with UNIX behavior, but be aware that enabling this
   feature might result in undesired behavior from other functions,
   such as gets, that rely on the carriage-return character.