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The features described in this section are deprecated; you must not use any of them in new code, and should remove their use from older but still maintained code: they will be withdrawn the next major Automake release (1.13).
Some packages, notably GNU GCC and GNU gdb, used to have a build environment originally written at Cygnus Support (subsequently renamed Cygnus Solutions, and then later purchased by Red Hat). Packages with this ancestry are sometimes referred to as “Cygnus” trees.
A Cygnus tree has slightly different rules for how a Makefile.in is to be constructed. Passing --cygnus to automake will cause any generated Makefile.in to comply with Cygnus rules.
Here are the precise effects of --cygnus:
TEXINFO_TEXvariable (see Texinfo).
checktarget doesn't depend on