Chapter 1. The Basics Revisited
This chapter covers material that might be considered basic GNU make knowledge but covers it to highlight commonly misunderstood functionality and clarify some confusing parts of GNU make. It also covers the differences between GNU make versions 3.79.1, 3.81, 3.82, and 4.0. If you’re working with a version prior to 3.79.1, you should probably upgrade.
This chapter is in no way a replacement for the official GNU make manual (Free Software Foundation, 2004). I highly recommend owning a copy of it. You can also find the manual at http://www.gnu.org/make/manual.
Getting Environment Variables into GNU make
Any variable set in the environment when GNU make is started will be available as a GNU make variable inside the makefile. ...
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