Return early in CMakeLists.txt to prevent re-adding dependency.
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cmake_minimum_required(VERSION 2.7)
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					cmake_minimum_required(VERSION 2.7)
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					if(TARGET regex)
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					  return()
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					endif(TARGET regex)
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project(libregex)
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					project(libregex)
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add_library(regex STATIC src/libregex.c)
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					add_library(regex STATIC src/libregex.c)
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