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must not use any of them in new code, and should remove their use from older but still maintained code: they will be withdrawn in a future Automake release.
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).
PATH. These tools are
checktarget doesn’t depend on