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Asked: 2026-05-23T11:29:27+00:00

I am trying to link my c++ program against the libcrypto library, using Cygwin

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I am trying to link my c++ program against the libcrypto library, using Cygwin and Windows.

I have this in my .cc file

#include <openssl/dh.h>

I have the header file dh.h in usr/include/openssl

And I have the required files (libeay32.dll and ssleay32.dll) in /usr/lib/ however, when I build (using the python build tool node-waf), I get errors such as undefined reference to _DH_new

I have tried various things in the cxxflags section of the build script, which now looks like this:

ppp.cxxflags = ["-g", "-D_FILE_OFFSET_BITS=64", "-D_LARGEFILE_SOURCE", "-Wall", "-L/usr/lib", "-lssl","-llibeay32","-lssleay32"]
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1 Answer

  1. Editorial Team

    Libcrypto.so is Linux’s dynamically linked library.
    According to this on Windows You need to use libeay32.a and ssleay32.a.
    If that doesn’t work You have to make your own library from OpenSSL source.

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