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+### Usage
+
+To build dependencies for the current arch+OS:
+
+ make
+
+To build for another arch/OS:
+
+ make HOST=host-platform-triplet
+
+For example:
+
+ make HOST=x86_64-w64-mingw32 -j4
+
+A prefix will be generated that's suitable for plugging into Bitcoin's
+configure. In the above example, a dir named x86_64-w64-mingw32 will be
+created. To use it for Bitcoin:
+
+ ./configure --prefix=`pwd`/depends/x86_64-w64-mingw32
+
+Common `host-platform-triplets` for cross compilation are:
+
+- `i686-w64-mingw32` for Win32
+- `x86_64-w64-mingw32` for Win64
+- `x86_64-apple-darwin11` for MacOSX
+- `arm-linux-gnueabihf` for Linux ARM 32 bit
+- `aarch64-linux-gnu` for Linux ARM 64 bit
+
+No other options are needed, the paths are automatically configured.
+
+Dependency Options:
+The following can be set when running make: make FOO=bar
+
+ SOURCES_PATH: downloaded sources will be placed here
+ BASE_CACHE: built packages will be placed here
+ SDK_PATH: Path where sdk's can be found (used by OSX)
+ FALLBACK_DOWNLOAD_PATH: If a source file can't be fetched, try here before giving up
+ NO_QT: Don't download/build/cache qt and its dependencies
+ NO_WALLET: Don't download/build/cache libs needed to enable the wallet
+ NO_UPNP: Don't download/build/cache packages needed for enabling upnp
+ DEBUG: disable some optimizations and enable more runtime checking
+ HOST_ID_SALT: Optional salt to use when generating host package ids
+ BUILD_ID_SALT: Optional salt to use when generating build package ids
+
+If some packages are not built, for example `make NO_WALLET=1`, the appropriate
+options will be passed to bitcoin's configure. In this case, `--disable-wallet`.
+
+Additional targets:
+
+ download: run 'make download' to fetch all sources without building them
+ download-osx: run 'make download-osx' to fetch all sources needed for osx builds
+ download-win: run 'make download-win' to fetch all sources needed for win builds
+ download-linux: run 'make download-linux' to fetch all sources needed for linux builds
+
+### Other documentation
+
+- [description.md](description.md): General description of the depends system
+- [packages.md](packages.md): Steps for adding packages
+