FreeBSD Porter's Handbook
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# 4.6 Handling user input

If your port requires user input to build, configure, or install, you must set `IS_INTERACTIVE` in your `Makefile`. This will allow ``overnight builds'' to skip your port if the user sets the variable `BATCH` in his environment (and if the user sets the variable `INTERACTIVE`, then only those ports requiring interaction are built). This will save a lot of wasted time on the set of machines that continually build ports (see below).

It is also recommended that if there are reasonable default answers to the questions, you check the `PACKAGE_BUILDING` variable and turn off the interactive script when it is set. This will allow us to build the packages for CDROMs and FTP.

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