build/pkg-config.sh: add comment
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#!/bin/sh -e
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#!/bin/sh -e
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# This is a wrapper for pkg-config which helps with cross-compiling;
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# it sets up environment variables to pkg-config searches for
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# libraries in the sysroot where a copy of this script is located.
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BIN=`dirname $0`
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BIN=`dirname $0`
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ROOT=`dirname "$BIN"`
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ROOT=`dirname "$BIN"`
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