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Manual.md: Clarify the role of {{host,}make,}depends

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Toyam Cox 2016-10-11 12:30:46 -04:00
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@ -18,6 +18,7 @@ packages for XBPS, the `Void Linux` native packaging system.
* [Available variables](#available_vars)
* [Mandatory variables](#mandatory_vars)
* [Optional variables](#optional_vars)
* [About the depends variables](#explain_depends)
* [Repositories](#repositories)
* [Repositories defined by Branch](#repo_by_branch)
* [Package defined repositories](#pkg_defined_repo)
@ -531,6 +532,30 @@ Example:
A list is composed of three components separated by a colon: group, symlink and target.
i.e `alternatives="vi:/usr/bin/vi:/usr/bin/nvi ex:/usr/bin/ex:/usr/bin/nvi-ex"`.
<a id="explain_depends"></a>
#### About the many types of `depends` variable.
So far we have listed three types of `depends`, there are `hostmakedepends`,
`makedepends`, and plain old `depends`. To understand the difference between
them, understand this: Void Linux cross compiles for many arches. Sometimes in
a build process, certain programs must be run, for example `yacc`, or the
compiler itself for a C program. Those programs get put in `hostmakedepends`.
When the build runs, those will be installed on the host to help the build
complete. Please note that anything that is a dependency of `base-devel` will
already be installed, and should not be listed here.
Then there are those things for which a package either links against or
includes header files. These are `makedepends`, and regardless of the
architecture of the build machine, the architecture of the target machine must
be used. Typically the `makedepends` will be the only one of the three types of
`depends` to include `-devel` packages, and typically only `-devel` packages.
The final variable, `depends`, is for those things the package needs at
runtime and without which is unusable, and that xbps can't auto-detect.
These are not all the packages the package needs at runtime, but only those
that are not linked against. This variable is most useful for non-compiled
programs.
<a id="repositories"></a>
#### Repositories