[CMake] Using an alternative version of a tool during the build of a project

[Cosmere Infahm]

Hello,

I have a project that depends on autoconf 2.68 or later. But the default
version of autoconf on my build distro is older. So I have private version
of autoconf 2.68 that I would like to build and use to build my project.

What is the recommended approach to forcing the use of the private version
of autoconf during the cmake build of my project?

Thanks
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