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The following page is a combination of the INSTALL file provided with the OpenSSL library and notes from the field. If you have questions about what you are doing or seeing, then you should consult INSTALL since it contains the commands and specifies the behavior by the development team.

OpenSSL uses a custom build system to configure the library. Configuration will allow the library to set up the recursive makefiles from makefile.org. Once configured, you use make to build the library. You should avoid custom build systems because they often miss details, like each architecture and platform has a unique opensslconf.h and bn.h generated by Configure.

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You must use a C compiler to build the OpenSSL library. You cannot use a C++ compiler. Later, once the library is built, it is OK to create user programs with a C++ compiler. But the library proper must be built with a C compiler.

There are two generations of build system. First is the build system used in OpenSSL 1.0.2 and below. The instructions below apply to it. Second is the build system for OpenSSL 1.1.0 and above. The instructions are similar, but not the same. For example, the second generation abandons the monolithic Configure and places individual configurations in the Configurations directory. Also, the second generation is more platform agnostic and uses templates to produce a final, top level build file (Makefile, descrip.mms, what have you).

After you configure and build the library, you should always perform a make test to ensure the library performs as expected under its self tests. If you are building OpenSSL 1.1.0 and above, then you will also need PERL 5.10 or higher (see README.PERL for details).

If your platform is not listed, then use a similar platform and tune the $cflags and $ldflags by making a copy of the configure line and giving it its own name. $cflags and $ldflags correspond to fields 2 and 6 in a configure line. An example of using a similar configure line is presented in Using RPATHs.

You use Configure and config to tune the compile and installation process through options and switches. The difference between is Configure properly handles the host-arch-compiler triplet, and config does not. config attempts to guess the triplet, so it's a lot like autotool's config.guess.

OpenSSL 1.1.0 and above performs the dependency step for you, so you should not see the message. However, you should perform a make clean to ensure the list of objects files is accurate after a reconfiguration.

OpenSSL has been around a long time, and it carries around a lot of cruft. For example, from above, SSLv2 is enabled by default. SSLv2 is completely broken, and you should disable it during configuration. You can disable protocols and provide other options through Configure and config, and the following lists some of them.

Note: on older OSes, like CentOS 5, BSD 5, and Windows XP or Vista, you will need to configure with no-async when building OpenSSL 1.1.0 and above. The configuration system does not detect lack of the Posix feature on the platforms.

--prefix and --openssldir control the configuration of installed components. The behavior and interactions of --prefix and --openssldir are slightly different between OpenSSL 1.0.2 and below, and OpenSSL 1.1.0 and above.

One word of caution is avoid --prefix=/usr when OpenSSL versions are not binary compatible. You will replace the distro's version of OpenSSL with your version of OpenSSL. It will most likely break everything, including the package management system.

You can omit If --prefix and use --openssldir. In this case, the paths for --openssldir will be used during configuration. If --openssldir is not specified, the the default /usr/local/ssl is used.

From the list above, it's possible to quickly configure a "debug" build with ./config -d. However, you can often get into a more amicable state without the Electric Fence dependency by issuing:

Sometimes you need to work around OpenSSL's selections for building the library. For example, you might want to use -Os for a mobile device (rather than -O3), or you might want to use the clang compiler (rather than gcc).

In case like these, its' often easier to modify Configure and Makefile.org rather than trying to add targets to the configure scripts. Below is a patch that modifies Configure and Makefile.org for use under the iOS 7.0 SDK (which lacks gcc in /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/):

RPATH's are supported by default on the BSD platforms, but not others. If you are working on Linux and compatibles, then you have to manually add an RPATH. One of the easiest ways to add a RPATH is to configure with it as shown below.

Note well: you should use a RPATH or RUNPATH when building both OpenSSL and your program. If you don't add a RPATH or RUNPATH to both, then your program could runtime-link to the wrong version of OpenSSL. Linking against random versions of a security library is not a good idea.

You can also add an RPATH or RUNPATH by hard coding the RPATH into a configure line. For example, on Debian x86_64 open the file Configure in an editor, copy linux-x86_64, name it linux-x86_64-rpath, and make the following change to add the -rpath option. Notice the addition of -Wl,-rpath=... in two places.

If you want to use FIPS validated cryptography, you download, build and install the FIPS Object Module (openssl-fips-2.0.5.tar.gz) according to the FIPS User Guide 2.0 and FIPS 140-2 Security Policy. You then download, build and install the FIPS Capable Library (openssl-1.0.1e.tar.gz).

If you disable an option during configure, you can check if it's available through OPENSSL_NO_* defines. OpenSSL writes the configure options to . For example, if you want to know if SSLv3 is available, then you would perform the following in your code:

3noch wrote a VERY good guide in 2012 here (PLEASE NOTE: the guide was written in 2012 and is no longer available at the original location; the link now points to an archived version at the Internet Archive Wayback Machine).

Read first the INSTALL.W64 documentation note containing some specific 64bits information.See also INSTALL.W32 that still provides additonnal build information common to both the 64 and 32 bit versions.

You may be surprised: the 64bit artefacts are indeed output in the out32* sub-directories and bear names ending *32.dll. Fact is the 64 bit compile target is so far an incremental change over the legacy 32bit windows target. Numerous compile flags are still labelled "32" although those do apply to both 32 and 64bit targets.

The important pre-requisites are to have PERL available (for essential file processing so as to prepare sources and scripts for the target OS) and of course a C compiler like Microsoft Visual Studio for C/C++. Also note the procedure changed at OpenSSL 1.1.0 and is more streamlined. Also see Why there is no ms\do_ms.bat after perl Configure VC-WIN64A on Stack Overflow.

OpenSSL uses its own configuration system, and does not use Autoconf. However, a number of popular projects use both OpenSSL and Autoconf, and it would be useful to detect either OPENSSL_init_ssl or SSL_library_init from libssl. To craft a feature test for OpenSSL that recognizes both OPENSSL_init_ssl and SSL_library_init, you can use the following.