1. Oracle Linux Errata Details: ELSA-2021-9151. Description 1.1.1g-15 - version bump 1.1.1g-14 - CVE-2021-3450 openssl: CA certificate check.
  2. OpenSSL is a library that provides cryptographic functionality, specifically SSL/TLS for popular applications such as secure web servers (nginx web server, Apache web server) and MySQL database server.

Openssl Shared Library Download

Furthermore if you look at openssl-libs you'll find the library files. – Pryftan Jun 8 '19 at 16:16. Add a comment 3. Your issue sounds like curl wasn't compiled with openssl support. You can confirm by checking to see what protocols curl supports. Building PyPy from Source¶. For building PyPy, we recommend installing a pre-built PyPy first (see Downloading and Installing PyPy).It is possible to build PyPy with CPython, but it will take a lot longer to run – depending on your architecture, between two and three times as long.

I am returning to a code base that had been developed 6-7 years ago and am tasked with moving it to 'current' tools and versions (joy!).

The original code used a build of Qt 5.4 with OpenSSL 1.0.2d statically linked.

I downloaded the source for OpenSSL 1.1.1g and built the win32 release target.

Then I downloaded the zip file of the Qt5.15 files from and unzipped it to do the build. I am using a Windows 10 machine with Visual Studio 2019.


Based on the old 'config' arguments that we used when building Qt 5.4, I am trying to use similar arguments for the Qt 5.15 build:

configure -prefix c:Qt5_15_Build -opensource -confirm-license -nomake tests -nomake examples -platform win32-msvc -opengl desktop -debug-and-release -openssl-linked OPENSSL_LIBS='-llibcrypto -llibssl' -I C:SSLBuildLibx32Releaseinclude -L C:SSLBuildLibx32Releaselib

When I try to run this, I get the following error: ERROR:: Feature 'openssl-linked' was enabled, but the pre-condition '!features.securetransport && !features.schannel && libs.openssl' failed.

Google searches have led me to various attempts to tweak the format in which the OpenSSL header file and library paths are specified, but I always get the same results. (I also learned to delete the config.cache file!!!)

The contents of the config.log have not been useful to me in attempting to determine the issue.

Any help/guidance would be appreciated. Seems like this 'should' be do-able.



For building PyPy, we recommend installing a pre-built PyPy first (seeDownloading and Installing PyPy). It is possible to build PyPy with CPython, but it will take alot longer to run – depending on your architecture, between two and threetimes as long.


Even when using PyPy to build PyPy, translation is time-consuming – 30minutes on a fast machine – and RAM-hungry. You will need at least 2 GBof memory on a 32-bit machine and 4GB on a 64-bit machine.

Before you start¶

Our normal development workflow avoids a full translation by using test-drivendevelopment. You can read more about how to develop PyPy here, and latesttranslated (hopefully functional) binary packages are available on ourbuildbot’s nightly builds

You will need the build dependencies below to run the tests.

Clone the repository¶

If you prefer to compile your own PyPy, or if you want to modify it, youwill need to obtain a copy of the sources. This can be done either bydownloading them from the download page or by checking them out from therepository using mercurial. We suggest using mercurial if you want to accessthe current development.

You must issue the following command on yourcommand line, DOS box, or terminal:

This will clone the repository and place it into a directorynamed pypy, and will get you the PyPy source in pypy/pypy anddocumentation files in pypy/pypy/doc.We try to ensure that the tip is always stable, but it mightoccasionally be broken. You may want to check out our nightly tests:find a revision (12-chars alphanumeric string, e.g. “963e808156b3”)that passed at least the{linux32} tests (corresponding to a + sign on theline success) and then, in your cloned repository, switch to this revisionusing:

where XXXXX is the revision id.

Install build-time dependencies¶

Centos 7 Openssl Rpm

(Note: for some hints on how to translate the Python interpreter underWindows, see the windows document .

Libssl vs openssl

The host Python needs to have CFFI installed. If translating on PyPy, CFFI isalready installed. If translating on CPython, you need to install it, e.g.using python-mpipinstallcffi.

To build PyPy on Unix using the C translation backend, you need at least a Ccompiler and make installed. Further, some optional modules have additionaldependencies:

cffi, ctypes
libffi, pkg-config
libunwind (optional, loaded dynamically at runtime)

Make sure to have these libraries (with development headers) installedbefore building PyPy, otherwise the resulting binary will not containthese modules. Furthermore, the following libraries should be presentafter building PyPy, otherwise the corresponding CFFI modules are notbuilt (you can run or re-run lib_pypy/pypy_tools/ tobuild them; you don’t need to re-translate the whole PyPy):

_ssl, _hashlib
libncurses-dev (for PyPy2)libncursesw-dev (for PyPy3)
lzma (PyPy3 only)
liblzma or libxz, version 5 and up

To run untranslated tests, you need the Boehm garbage collector libgc, version7.4 and up

On Debian and Ubuntu (16.04 onwards), this is the command to installall build-time dependencies:

On Fedora:

On SLES11:

On Mac OS X:

Most of these build-time dependencies are installed alongsidethe Developer Tools. However, note that in order for the installation tofind them you may need to run:

An exception is OpenSSL, which is no longer provided with the operatingsystem. It can be obtained via Homebrew (with $brewinstallopenssl),but it will not be available on the system path by default. The easiestway to enable it for building pypy is to set an environment variable:

After setting this, translation (described next) will find the OpenSSL libsas expected.

Run the translation¶

We usually translate in the pypy/goal directory, so all the followingcommands assume your $pwd is there.

Translate with JIT:

Translate without JIT:

Note this translates pypy via the file, so theseare shorthand for:

More help is availabe via --help at either option position, and more infocan be found in the Configuration Options for PyPy section.

Centos Install Openssl Libs

(You can use python instead of pypy here, which will take longerbut works too.)

If everything works correctly this will:

  1. Run the rpython translation chain, producing a database of theentire pypy interpreter. This step is currently singe threaded, and RAMhungry. As part of this step, the chain creates a large number of C codefiles and a Makefile to compile them in adirectory controlled by the PYPY_USESSION_DIR environment variable.
  2. Create an executable pypy-c by running the Makefile. This step canutilize all possible cores on the machine.
  3. Copy the needed binaries to the current directory.
  4. Generate c-extension modules for any cffi-based stdlib modules.

The resulting executable behaves mostly like a normal Pythoninterpreter (see Differences between PyPy and CPython), and is ready for testing, foruse as a base interpreter for a new virtualenv, or for packaging into a binarysuitable for installation on another machine running the same OS as the buildmachine.

Note that step 4 is merely done as a convenience, any of the steps may be rerunwithout rerunning the previous steps.

Making a debug build of PyPy¶

Rerun the Makefile with the makelldebug or makelldebug0 target,which will build in a way that running under a debugger makes sense.Appropriate compilation flags are added to add debug info, and for lldebug0compiler optimizations are fully disabled. If you stop in a debugger, you willsee the very wordy machine-generated C code from the rpython translation step,which takes a little bit of reading to relate back to the rpython code.

Openssl Build From Source

Build cffi import libraries for the stdlib¶

Various stdlib modules require a separate build step to create the cffiimport libraries in the out-of-line API mode. This is done by the followingcommand:

Packaging (preparing for installation)¶

Packaging is required if you want to install PyPy system-wide, even toinstall on the same machine. The reason is that doing so prepares anumber of extra features that cannot be done lazily on a root-installedPyPy, because the normal users don’t have write access. This concernsmostly libraries that would normally be compiled if and when they areimported the first time.

This creates a clean and prepared hierarchy, as well as a .tar.bz2with the same content; both are found by default in/tmp/usession-YOURNAME/build/. You can then either move the filehierarchy or unpack the .tar.bz2 at the correct place.

Openssl Libssl

It is recommended to use because custom scripts willinvariably become out-of-date. If you want to write custom scriptsanyway, note an easy-to-miss point: some modules are written with CFFI,and require some compilation. If you install PyPy as root withoutpre-compiling them, normal users will get errors:

  • PyPy 2.5.1 or earlier: normal users would see permission errors.Installers need to run pypy-c'importgdbm' and other similarcommands at install time; the exact list is inpypy/tool/release/ Usersseeing a broken installation of PyPy can fix it after-the-fact if theyhave sudo rights, by running once e.g. sudopypy-c'importgdbm.
  • PyPy 2.6 and later: anyone would get ImportError:nomodulenamed_gdbm_cffi. Installers need to run in thelib_pypy directory during the installation process (plus others;see the exact list in pypy/tool/release/ seeing a brokeninstallation of PyPy can fix it after-the-fact, by running pypy/path/to/lib_pypy/ This command produces a filecalled locally, which is a C extensionmodule for PyPy. You can move it at any place where modules arenormally found: e.g. in your project’s main directory, or in adirectory that you add to the env var PYTHONPATH.


Openssl_libs Environment Variable

PyPy dynamically finds the location of its libraries depending on the locationof the executable. The directory hierarchy of a typical PyPy installationlooks like this:

The hierarchy shown above is relative to a PREFIX directory. PREFIX iscomputed by starting from the directory where the executable resides, and“walking up” the filesystem until we find a directory containing lib_pypyand lib-python/2.7.

To install PyPy system wide on unix-like systems, it is recommended to put thewhole hierarchy alone (e.g. in /opt/pypy) and put a symlink to thepypy executable into /usr/bin or /usr/local/bin.

If the executable fails to find suitable libraries, it will report debug:WARNING:librarypathnotfound,usingcompiled-insys.path and then attemptto continue normally. If the default path is usable, most code will be fine.However, the sys.prefix will be unset and some existing libraries assumethat this is never the case.