File: make.info, Node: Conditionals, Next: Functions, Prev: Using Variables, Up: Top 7 Conditional Parts of Makefiles ******************************** A "conditional" directive causes part of a makefile to be obeyed or ignored depending on the values of variables. Conditionals can compare the value of one variable to another, or the value of a variable to a constant string. Conditionals control what 'make' actually "sees" in the makefile, so they _cannot_ be used to control recipes at the time of execution. * Menu: * Conditional Example:: Example of a conditional * Conditional Syntax:: The syntax of conditionals. * Testing Flags:: Conditionals that test flags.