doc/source/install.rst: BuildStream depends on 'patch'
You will get errors like this if not:
"
Traceback (most recent call last):
File "/root/.local/bin/bst", line 11, in <module>
load_entry_point('BuildStream==0.1.dev1642+g8c0aaa1', 'console_scripts', 'bst')()
File "/root/.local/lib/python3.6/site-packages/click/core.py", line 722, in __call__
return self.main(*args, **kwargs)
File "/root/.local/lib/python3.6/site-packages/buildstream/_frontend/main.py", line 132, in override_main
standalone_mode=standalone_mode, **extra)
File "/root/.local/lib/python3.6/site-packages/click/core.py", line 697, in main
rv = self.invoke(ctx)
File "/root/.local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/root/.local/lib/python3.6/site-packages/click/core.py", line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/root/.local/lib/python3.6/site-packages/click/core.py", line 535, in invoke
return callback(*args, **kwargs)
File "/root/.local/lib/python3.6/site-packages/click/decorators.py", line 27, in new_func
return f(get_current_context().obj, *args, **kwargs)
File "/root/.local/lib/python3.6/site-packages/buildstream/_frontend/main.py", line 219, in build
app.pipeline.initialize(use_remote_cache=True, inconsistent=track)
File "/root/.local/lib/python3.6/site-packages/buildstream/_pipeline.py", line 142, in initialize
self.preflight()
File "/root/.local/lib/python3.6/site-packages/buildstream/_pipeline.py", line 155, in preflight
plugin.preflight()
File "/root/.local/lib/python3.6/site-packages/buildstream/plugins/sources/patch.py", line 61, in preflight
self.host_patch = utils.get_host_tool("patch")
File "/root/.local/lib/python3.6/site-packages/buildstream/utils.py", line 417, in get_host_tool
raise ProgramNotFoundError("Did not find '{}' in PATH: {}".format(name, search_path))
buildstream.utils.ProgramNotFoundError: Did not find 'patch' in PATH: /root/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
"
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