The file `mk.conf` is the central configuration file for everything that has to do with building software. It is used by the BSD-style `Makefiles` in `/usr/share/mk` and especially by pkgsrc. Usually, it is found in the `/etc` directory. If it doesn't exist there, feel free to create it.
Because all configuration takes place in a single file, there are some variables so the user can choose different configurations based on whether he is building the base system or packages from pkgsrc. These variables are:
* `BSD_PKG_MK`: Defined when a pkgsrc package is built.
* `BUILDING_HTDOCS`: Defined when the NetBSD web site is built.
* None of the above: When the base system is built. The file /usr/share/mk/bsd.README is a good place to start in this case.
A typical `mk.conf` file would look like this:
<pre><code>
# This is /etc/mk.conf
#
.if defined(BSD_PKG_MK) || defined(BUILDING_HTDOCS)
# The following lines apply to both pkgsrc and htdocs.
#...
LOCALBASE= /usr/pkg
#...
.else
# The following lines apply to the base system.
WARNS= 4
.endif
</code></pre>
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