my $IS_MULTI_ICE_PRESENT = 1;
    my $IS_I2C_PRESENT = 0;
    ...
    use MyUtils:;MultiICE if ($IS_MULTI_ICE_PRESENT);
    use MyUtils:;I2C if ($IS_I2C_PRESENT);
    ...

##</code><code>##

    #define IS_MULTI_ICE_PRESENT 1
    #define IS_I2C_PRESENT       0
    ...
    #if IS_MULTI_ICE_PRESENT
    #include "multi_ice.h"
    #endif
    #if IS_I2C_PRESENT
    #include "i2c.h"
    #endif
    ...