<sect2>
<title>Command explanations</title>
<para><command>ZLIBINC=/usr/include ZLIBLIB=/usr/lib</command> : This forces libpng to look for the zlib includes and libraries where we have them installed.</para>
<para><command>-f scripts/makefile.linux</command> : This points
make at the Linux version of the makefile as
<application>libpng</application> doesn't use a
autoconf routine instead coming with various makefiles for different
platforms.</para>
</sect2>
