[yocto] how to add a new environment in poky

[Wangdawei]

Hi
         I need to add a new environment that LD_LIBRARY_PATH when I use my own external toolchain .
         I add 1 line in external-toolchain.inc "LD_LIBRARY_PATH =. "${EXTERNAL_TOOLCHAIN}/i586-target-linux-gnu/lib:"",but there is no effect.when I used this toolchain to compile , there also isn't this value , so I want to ask how to add a environment in poky ? the run.compile.xxx script can get the value ?

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thanks & rgds

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