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6. Writing `configure.in'
Writing a portable `configure.in' is a tricky business. Since you
can put arbitrary shell code into `configure.in', 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
`configure.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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