Question

I have a C program that link the ssl library(md5.h) :

#if defined(__APPLE__)
#  define COMMON_DIGEST_FOR_OPENSSL
#  include <CommonCrypto/CommonDigest.h>
#  define SHA1 CC_SHA1
#else
#  include <openssl/md5.h>
#endif

every thing works fine on Linux and Mac Os X, compiling with this command line :

gcc program.c -o prog -lssl

Now i want to compile it for windows, so i have installed MinGw on my Debian, and i’m trying to cross compile with this command line :

i586-mingw32msvc-gcc program.c -o program.exe -lssl

but i get this compilation error :

error: openssl/md5.h: No such file or directory

Why? How can i solve this problem ?

Answer 1

You need OpenSSL built for Windows where the compiler can find it.
The easiest way is to build from source, and install into a prefix the mingw compiler can find it (or pass the include and library paths to your build system).

OpenSSL is a third party lib, so it’s not part of the mingw package.