晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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/*! \page relocatable Relocatable packages

Relocatable packages are a way to give the user a little control
over the installation location of a package.  For example, a vendor
may distribute their software to install in "/opt" but you'd like
it to install in "/usr/opt".  If the vendor were distributing a
relocatable RPM package, it would be easy.

\section relocatable_building Building a Relocatable Package

Not all software can be "relocatable".  Before continuing you should
think about how the program works, what files it accesses, what other
programs access *it* (and expect it to be in a certain place), etc.
If you determine that the location of the package doesn't matter,
then it can probably be built as "relocatable".

All you need to do to build a relocatable package is put one or more:

\verbatim
  Prefix: <dir>
\endverbatim

in your spec file.  The "<dir>" will usually be something like "/usr",
"/usr/local", or "/opt".  Every file in your %files list must start
with that prefix.  For example, if you have "Prefix: /usr" and your
%files list contains "/etc/foo.conf", the build will fail. The fix for
this is to put

\verbatim
  Prefix: /usr
  Prefix: /etc
\endverbatim

into the spec file so that the /usr and /etc directories may be
relocated separately when this package is installed.


\section relocatable_installing Installing Relocatable Packages

By default, RPM will install a relocatable package in the prefix
directory listed in the spec file.  You can override this on the
RPM install command line with "--prefix <dir>".  For example, if
the package in question were going to be installed in "/opt" but
you don't have enough disk space there (and it is a relocatable
package), you could install it "--prefix /usr/opt".

If there is more then one Prefix you may relocate each prefix
separately by using syntax like:

\verbatim
  rpm ... --relocate /opt=/usr/opt --relocate /etc=/usr/etc ...
\endverbatim

If any of the Prefixes is not being relocated they can be skipped on
the command line

*/

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