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6. Writing `'

Writing a portable `' is a tricky business. Since you can put arbitrary shell code into `', your options seem overwhelming. There are many questions the first-time Autoconf user asks: What constructs are portable and what constructs aren't portable? How do I decide what to check for? What shouldn't I check for? How do I best use Autoconf's features? What shouldn't I put in `'? In what order should I run my checks? When should I look at the name of the system instead of checking for specific features?

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