lfs-book-zh_CN/chapter06/bzip2-exp.xml

<sect2>
<title>Command explanations</title>

<para>
<userinput>make -f Makefile-libbz2_so:</userinput> This will cause bzip2
to be build using a different Makefile file, in this case the
Makefile-libbz2_so file which creates a dynamic libbz2.so library and
links the bzip2 utilities against it.
</para>

<para>
The reason we don't use <userinput>make install</userinput> is that
bzip2's make install doesn't install the shared libbz2.so, nor the bzip2
binary that's linked against that library. So we have no choice but to
manually install the files.
</para>

</sect2>