5.2.1 #IFDEF

Syntax:

Lines following #IFDEF are skipped read if the keyword name following it is not dened.

They are read until the keywords #ELSE or #ENDIF are encountered, after which normal processing is resumed.

Example :

In the above example, /usr/lib/fpc/0.99.5/linuxunits will be added to the path if you're compiling with version 0.99.5 of the compiler.