Setting How to set a variable in the makefile. Appending How to append more text to the old valueof a variable. Override Directive How to set a variable in the makefile even ifthe user has set it with a command argument. Defining An alternate way to set a variableto a verbatim string. Environment Variable values can come from the environment.
Some special variables have predefinedmeanings for use with implicit rules.
Referencing a variable withsubstitutions on the value. Computed Names Computing the name of the variable to refer to. The syntax of conditionals. Testing Flags Conditionals that test flags. Functions for Transforming Text Syntax of Functions How to write a function call.