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### Usage
To build dependencies for the current arch+OS:
```bash
make
```
To build for another arch/OS:
```bash
make HOST=host-platform-triplet
```
For example:
```bash
make HOST=x86_64-w64-mingw32 -j4
```
A toolchain will be generated that's suitable for plugging into Monero's
cmake. In the above example, a dir named x86_64-w64-mingw32 will be
created. To use it for Monero:
```bash
cmake -DCMAKE_TOOLCHAIN=`pwd`/contrib/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
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
```
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
```
#Darwin (macos) builds:
To build with the x86_64-apple-darwin11 you require the mac os developer tools in MacOSX10.11.sdk.
Download it from apple, or search for it on github. Create a new directoty called SDKs in this
directory and place the entire MacOSX10.11.sdk folder in it. The depends build will then pick it up automatically
(without requiring SDK_PATH).
#Mingw builds
Building for 32/64bit mingw requires switching alternatives to a posix mode
```bash
update-alternatives --set x86_64-w64-mingw32-g++ x86_64-w64-mingw32-g++-posix
update-alternatives --set x86_64-w64-mingw32-gcc x86_64-w64-mingw32-gcc-posix
```
### Other documentation
- [description.md](description.md): General description of the depends system
- [packages.md](packages.md): Steps for adding packages
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