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Portability
Note that conditionals in Automake 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.