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automake-1.16: Conditionals

 
 20 Conditionals
 ***************
 
 Automake supports a simple type of conditional.
 
    These conditionals are not the same as conditionals in GNU Make.
 Automake conditionals are checked at configure time by the ‘configure’
 script, and affect the translation from ‘Makefile.in’ to ‘Makefile’.
 They are based on options passed to ‘configure’ and on results that
 ‘configure’ has discovered about the host system.  GNU Make conditionals
 are checked at ‘make’ time, and are based on variables passed to the
 make program or defined in the ‘Makefile’.
 
    Automake conditionals will work with any make program.

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· Usage of Conditionals       Declaring conditional content
· Limits of Conditionals      Enclosing complete statements
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