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23 The effect of --cygnus

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must not use any of them in new code, and should remove their use from older but still maintained code: they will be withdrawn the next major Automake release (1.13).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 is to be constructed. Passing --cygnus to automake will cause any generated to comply with Cygnus rules.

Here are the precise effects of --cygnus: