GCBASIC documentation
Compiler Directives

Syntax:

    #ifnot Condition
      ...
    [#else]
      ...
    #endif

Explanation:

The #ifnot directive is used to prevent a section of code from compiling unless Condition is false.

Condition has the same syntax as the condition in a normal GCBASIC if command. The only difference is that it uses constants instead of variables and does not use "then".

Example:

    'This program will set the constant to true only if NOT a PIC family
    #chip 16F88, 8

    #ifnot ChipFamily = 14

      #define myConstant True

    #endif