I needed to compile my own rpm with `--with-lua` support as my system
(slackware) ships with rpm configured with the `--without-lua-support` flag.
However, the Lua that my system provides (actually slackbuilds.org provides) is
version 5.1.5, but the `--with-lua-support` flag requires at least version 5.2.
Fortunately (I thought) my system also provides a package named `lua52` that
installs Lua version 5.2.4. So I removed the old `lua` package and installed
this package, but to my surprise when I went to compile rpm with the
`--with-lua` support I got the same error as before:
```
checking for lua >= 5.2... no
configure: error: lua not present or too old (--without-lua to disable)
```
It turns out that the problem was that `pkg-config` only looks for a file named
`lua.pc` in `$PKG_CONFIG_PATH`, but this `lua52` package only installs a file
into `$PKG_CONFIG_PATH` named `lua52.pc` (and a symlink from this file named
`lua5.2.pc`). I was able to solve this problem by symlinking the `lua52.pc`
file to `lua.pc`. After creating this symlink I was able to build rpm with the
`--with-lua` flag just fine.
[Here](https://slackbuilds.org/repository/15.0/development/lua52/?search=lua52)
is a link to the `lua52` slackbuild.
I do not know if any other systems could be effected by this, but it would be
nice if `.pc` files with names such as `lua52.pc` could be found automatically.
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