Build OpenSSL with MinGW

OpenSSL is an open-source library that provides cryptographic and network security functions. It is used by so many open-source software that require SSL/TLS support. To build OpenSSL for Windows, first install MinGW. There are two flavors of MinGW: mingw and mingw64. Just pick one of the following and set it up accordingly:

• Installing MinGW on Windows
  
• Setting up MinGW64 with Cygwin
  

Then, download the latest source tarball from the OpenSSL website and unpack it with 7-zip. 7-zip should be used because MinGW/MSYS tar has trouble with tarballs containing symlinks. However, cygwin has no problem with tarballs containing symlinks.

OpenSSL optionally incorporates the following libraries when found.

• zlib
  
• pthreads-win32
  

Assuming that you compiled both zlib and pthread as shown in the above links, configure OpenSSL like this.

./Configure -DHAVE_STRUCT_TIMESPEC -DPTW32_STATIC_LIB -L/mingw/lib -lz -lpthreadGC2 -lws2_32 --prefix=/mingw threads zlib mingw

Then, run make.

make

If you run into errors compiling some test codes, just copy dummytest.c over. However, it doesn't happen under Cygwin.

cp -iv test/dummytest.c test/md2test.c
cp -iv test/dummytest.c test/rc5test.c
cp -iv test/dummytest.c test/jpaketest.c

Then, install OpenSSL.

make install