Hi, I have been working with OpenSSL 1.1.1a on Linux. We have a number of patches that are applied, including a specific version of cmpossl. To ensure that all new error codes, objects etc. are available I run "make update" after config. I.e. the build process is Unpack original distribution openssl-1.1.1a.tar.gz Apply list of patches ./config make update && make && make test Some colleagues have asked me for a Windows executable, so I have now installed ActivePerl 5.26.3 and Visual Studio 2019 on my Windows 7 desktop. The unmodified openssl-1.1.1a builds and runs just fine using Configure VC-WIN64A-masm. But with our patches applied the build fails once it gets to crypto/cmp because the include files cmperr.h and crmferr.h do not exist. On Linux these are created by make update. The Windows Makefile does not have a target "update" (or "errors" for that matter). So what is the equivalent of make update or make errors on Windows? I am wondering if I can simply copy the updated files from Linux (new _err.h, modified obj_dat.h and probably a few more) but I would prefer an official way to (re)generate them on Windows. Regards, Andrew.