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Dependencies
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============
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These are the dependencies currently used by Bitcoin Core. You can find instructions for installing them in the `build-*.md` file for your platform.
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| Dependency | Version used | Minimum required | CVEs | Shared | [Bundled Qt library](https://doc.qt.io/qt-5/configure-options.html#third-party-libraries) |
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| --- | --- | --- | --- | --- | --- |
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| Berkeley DB | [4.8.30](https://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html) | 4.8.x | No | | |
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| Boost | [1.70.0](https://www.boost.org/users/download/) | [1.47.0](https://github.com/bitcoin/bitcoin/pull/8920) | No | | |
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| Clang | | [3.3+](https://releases.llvm.org/download.html) (C++11 support) | | | |
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| Expat | [2.2.7](https://libexpat.github.io/) | | No | Yes | |
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| fontconfig | [2.12.1](https://www.freedesktop.org/software/fontconfig/release/) | | No | Yes | |
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| FreeType | [2.7.1](https://download.savannah.gnu.org/releases/freetype) | | No | | |
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| GCC | | [4.8+](https://gcc.gnu.org/) (C++11 support) | | | |
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| HarfBuzz-NG | | | | | |
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| libevent | [2.1.11-stable](https://github.com/libevent/libevent/releases) | 2.0.22 | No | | |
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| libpng | | | | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) |
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| librsvg | | | | | |
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| MiniUPnPc | [2.0.20180203](https://miniupnp.tuxfamily.org/files) | | No | | |
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| PCRE | | | | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) |
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| Python (tests) | | [3.5](https://www.python.org/downloads) | | | |
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| qrencode | [3.4.4](https://fukuchi.org/works/qrencode) | | No | | |
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| Qt | [5.9.7](https://download.qt.io/official_releases/qt/) | [5.5.1](https://github.com/bitcoin/bitcoin/issues/13478) | No | | |
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| XCB | | | | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) (Linux only) |
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| xkbcommon | | | | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) (Linux only) |
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| ZeroMQ | [4.3.1](https://github.com/zeromq/libzmq/releases) | 4.0.0 | No | | |
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| zlib | [1.2.11](https://zlib.net/) | | | | No |
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Controlling dependencies
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------------------------
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Some dependencies are not needed in all configurations. The following are some factors that affect the dependency list.
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#### Options passed to `./configure`
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* MiniUPnPc is not needed with `--with-miniupnpc=no`.
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* Berkeley DB is not needed with `--disable-wallet`.
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* Qt is not needed with `--without-gui`.
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* If the qrencode dependency is absent, QR support won't be added. To force an error when that happens, pass `--with-qrencode`.
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* ZeroMQ is needed only with the `--with-zmq` option.
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#### Other
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* librsvg is only needed if you need to run `make deploy` on (cross-compilation to) macOS.
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