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<chapter xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id='sec-standard-environment'>
<title>The Standard Environment</title>
<para>The standard environment is used by passing it as an input
called <envar>stdenv</envar> to the derivation, and then doing
<programlisting>
source $stdenv/setup</programlisting>
at the top of the builder.</para>
<para>Apart from adding the aforementioned commands to the
<envar>PATH</envar>, <filename>setup</filename> also does the
following:
<itemizedlist>
<listitem><para>All input packages specified in the
<envar>buildInputs</envar> environment variable have their
<filename>/bin</filename> subdirectory added to <envar>PATH</envar>,
their <filename>/include</filename> subdirectory added to the C/C++
header file search path, and their <filename>/lib</filename>
subdirectory added to the linker search path. This can be extended.
For instance, when the <command>pkgconfig</command> package is
used, the subdirectory <filename>/lib/pkgconfig</filename> of each
input is added to the <envar>PKG_CONFIG_PATH</envar> environment
variable.</para></listitem>
<listitem><para>The environment variable
<envar>NIX_CFLAGS_STRIP</envar> is set so that the compiler strips
debug information from object files. This can be disabled by
setting <envar>NIX_STRIP_DEBUG</envar> to
<literal>0</literal>.</para></listitem>
</itemizedlist>
</para>
<para>The <filename>setup</filename> script also exports a function
called <function>genericBuild</function> that knows how to build
typical Autoconf-style packages. It can be customised to perform
builds for any type of package. It is advisable to use
<function>genericBuild</function> since it provides facilities that
are almost always useful such as unpacking of sources, patching of
sources, nested logging, etc.</para>
<para>The definitive, up-to-date documentation of the generic builder
is the source itself, which resides in
<filename>pkgs/stdenv/generic/setup.sh</filename>.</para>
<xi:include href="custom-builder.xml" />
<xi:include href="debug-build.xml" />
</chapter>
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