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Add hints about OSVERSION

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Submitted by:	linimon
PR:		docs/64384
Approved by:	simon(mentor)
This commit is contained in:
Josef El-Rayes 2004-03-26 23:35:01 +00:00
parent c98b86b33f
commit 7f5c773237
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=20424
1 changed files with 24 additions and 0 deletions
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en_US.ISO8859-1/books/porters-handbook/book.sgml
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@ -6645,6 +6645,30 @@ bacula:*:910:910:Bacula Daemon:/var/db/bacula:/sbin/nologin</programlisting>
entirely.</para>
</sect1>
<sect1 id="dads-workarounds">
<title>Necessary workarounds</title>
<para>Sometimes it is necessary to work around bugs in
software included with older versions of &os;.</para>
<itemizedlist>
<listitem>
<para>Some versions of &man.make.1; were broken
on at least 4.8 and 5.0 with respect to handling
comparisons based on <makevar>OSVERSION</makevar>.
This would often lead to failures during
<command>make describe</command> (and thus, the overall
ports <command>make index</command>). The workaround is
to enclose the conditional comparison in spaces, e.g.:
<programlisting>if ( OSVERSION > 500023 )</programlisting>
Be aware that test-installing a port on 4.9 or 5.2
will <emphasis>not</emphasis> detect this problem.</para>
</listitem>
</itemizedlist>
</sect1>
<sect1 id="dads-misc">
<title>Miscellanea</title>