Hi, actually, when using fwrite function in R package data.table, an error occurs because the value returned by deflateBound function from libz (part of the system) is incorrect. This point seems fixed in zlib version 1.2.3.1 "Take into account wrapper variations in deflateBound()". DeflateBound() in current libz version (1.2.11) has been tested on many platforms and is OK. More details can be found on issue "fwrite gzip on OpenBSD error" on GitHub (https://github.com/Rdatatable/data.table/issues/5048) R data.table team accepted a patch that resolved the problem : openBSD succeeds now in all tests (with no OpenMP support reported when installing package). With this message, they can place a link in news item so that readers of data.table news can be reassured that it has been reported to OpenBSD team. Thanks, --- PhC
