6.22. Using Lua

6.22. Using Lua
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This section describes the status of the Lua libraries in the ports tree and its integration with the ports system.

6.22.1. Introduction

There are many versions of the Lua libraries and corresponding interpreters, which conflict between them (install files under the same name). In the ports tree this problem has been solved by installing each version under a different name using version number suffixes.

The obvious disadvantage of this is that each application has to be modified to find the expected version. But it can be solved by adding some additional flags to the compiler and linker.

6.22.2. Version Selection

A port using Lua only needs to have this line:

USES=	lua

If a specific version of Lua is needed, instructions on how to select it are given in the USES=lua part of Chapter 15, Using USES Macros.

6.22.3. Defined Variables

These variables are available in the port.

Table 6.37. Variables Defined for Ports That Use Lua

Name	Description
`LUA_VER`	The Lua version that is going to be used (for example, `5.1`)
`LUA_VER_STR`	The Lua version without the dots (for example, `51`)
`LUA_PREFIX`	The prefix where Lua (and components) is installed
`LUA_SUBDIR`	The directory under `${PREFIX}/bin`, `${PREFIX}/share` and `${PREFIX}/lib` where Lua is installed
`LUA_INCDIR`	The directory where Lua and tolua header files are installed
`LUA_LIBDIR`	The directory where Lua and tolua libraries are installed
`LUA_MODLIBDIR`	The directory where Lua module libraries (`.so`) are installed
`LUA_MODSHAREDIR`	The directory where Lua modules (`.lua`) are installed
`LUA_PKGNAMEPREFIX`	The package name prefix used by Lua modules
`LUA_CMD`	The path to the Lua interpreter
`LUAC_CMD`	The path to the Lua compiler

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