Programs are (a bit ugly) written in a mix of C and C++. First it was going to be only C, but it turned out libspopc is not good enough for the task (it does not parse messages), so I replaced it with vmime, which is a C++ lib. I compiled the programs using Mingw-w64 under Devuan (a derivative of Debian). There's currently no facility to build it uder something else, sorry. Everything is linked statically (so that the programs ca be just copy-pasted to some system and run there). Again, I haven't bothered making it possible to build differently. To build, You need to first `apt install g++-mingw-w64-i686 gcc-mingw-w64-i686`. Some other deps are also required for building libraries (at least for OpenSSL) - You'll see what's missing once You get an error. * OpenSSL Procedures are described in openssl-1.1.0h/INSTALL. Basically, You need to cd into openssl-1.10h/ and run `./Configure --cross-compile-prefix=i686-w64-mingw32- mingw` and `make`. At the and You should have libcrypto.a and libssl.a inside openssl-1.1.0h/. I haven't made any modification to OpenSSL lib. * Vmime I made a very ugly modification to certificate import code - I changed it to treat provided certs as DER instead of PEM format. Remember about that, if You decide to update the library to a newer version. I also added a mingw_cross_toolchain.cmake file in vmime-master/ to facilitate cross-compiling. Unfortunately, there weren't any instructions on how to do that, so I had to fight cmake for a while. Finally, I added build_for_losedows.sh script in vmime-master/. To build - just enter the library's directory and run the script. You should be left with libvmime.a in vmime-master/. * Iniparser I modified both the library sources and its Makefile. It should suffice to anter iniparser-4.1/ and run `make` there. You'll be left with a libiniparser.a. * The actual programs Make is used. If You've already prepared the libraries, just run `make` and hope it doesn't crash ;) pop.exe and push.exe shall be produced.