Introduce dependencies.md

This file contains explicit dependency information used for release
builds (version, link, etc).

doc/dependencies.md

@@ -0,0 +1,46 @@
+Dependencies
+============
+
+These are the dependencies currently used by PIVX Core. You can find instructions for installing them in the `build-*.md` file for your platform.
+
+| Dependency | Version used | Minimum required | CVEs | Shared | [Bundled Qt library](https://doc.qt.io/qt-5/configure-options.html#third-party-libraries) |
+| --- | --- | --- | --- | --- | --- |
+| Berkeley DB | [4.8.30](https://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html) | 4.8.x | No |  |  |
+| Boost | [1.64.0](https://www.boost.org/users/download/) | [1.47.0](https://github.com/bitcoin/bitcoin/pull/8920) | No |  |  |
+| Clang |  | [3.3+](https://llvm.org/releases/download.html) (C++11 support) |  |  |  |
+| D-Bus | [1.10.18](https://cgit.freedesktop.org/dbus/dbus/tree/NEWS?h=dbus-1.10) |  | No | Yes |  |
+| Expat | [2.2.6](https://libexpat.github.io/) |  | No | Yes |  |
+| fontconfig | [2.12.1](https://www.freedesktop.org/software/fontconfig/release/) |  | No | Yes |  |
+| FreeType | [2.7.1](https://download.savannah.gnu.org/releases/freetype) |  | No |  |  |
+| GCC |  | [4.8+](https://gcc.gnu.org/) (C++11 support) |  |  |  |
+| HarfBuzz-NG |  |  |  |  |  |
+| libevent | [2.1.8-stable](https://github.com/libevent/libevent/releases) | 2.0.22 | No |  |  |
+| libjpeg |  |  |  |  | [Yes](https://github.com/pivx-project/pivx/blob/master/depends/packages/qt.mk#L65) |
+| libpng |  |  |  |  | [Yes](https://github.com/pivx-project/pivx/blob/master/depends/packages/qt.mk#L64) |
+| librsvg | |  |  |  |  |
+| MiniUPnPc | [2.0.20180203](http://miniupnp.free.fr/files) |  | No |  |  |
+| OpenSSL | [1.0.1k](https://www.openssl.org/source) |  | Yes |  |  |
+| GMP | [6.1.2](https://gmplib.org/) | | No | | |
+| PCRE |  |  |  |  | [Yes](https://github.com/pivx-project/pivx/blob/master/depends/packages/qt.mk#L66) |
+| protobuf | [2.6.1](https://github.com/google/protobuf/releases) |  | No |  |  |
+| Python (tests) |  | [3.5](https://www.python.org/downloads) |  |  |  |
+| qrencode | [3.4.4](https://fukuchi.org/works/qrencode) |  | No |  |  |
+| Qt | [5.9.7](https://download.qt.io/official_releases/qt/) | [5.5.1](https://github.com/bitcoin/bitcoin/issues/13478) | No |  |  |
+| XCB |  |  |  |  | [Yes](https://github.com/pivx-project/pivx/blob/master/depends/packages/qt.mk#L87) (Linux only) |
+| xkbcommon |  |  |  |  | [Yes](https://github.com/pivx-project/pivx/blob/master/depends/packages/qt.mk#L86) (Linux only) |
+| ZeroMQ | [4.3.1](https://github.com/zeromq/libzmq/releases) | 4.0.0 | No |  |  |
+| zlib | [1.2.11](https://zlib.net/) |  |  |  | No |
+
+Controlling dependencies
+------------------------
+Some dependencies are not needed in all configurations. The following are some factors that affect the dependency list.
+
+#### Options passed to `./configure`
+* MiniUPnPc is not needed with  `--with-miniupnpc=no`.
+* Berkeley DB is not needed with `--disable-wallet`.
+* Qt is not needed with `--without-gui`.
+* If the qrencode dependency is absent, QR support won't be added. To force an error when that happens, pass `--with-qrencode`.
+* ZeroMQ is needed only with the `--with-zmq` option.
+
+#### Other
+* librsvg is only needed if you need to run `make deploy` on (cross-compilation to) macOS.