Fan configuration help

I'm setting up a custom laser machine using an skr2 control board and I think the final config in trying to figure out is the fans/laser ports/pins.

I'm trying to use 3-4 fans ports as follows:
PB5 (fan2) laser pwm
PB6 (fan1) laser cooling fan (+maybe air assist)
PB7 (fan0) case/controller auto fan
PE5 (servo) alternate air assist with external mosfet possibly

When I try to set the CONTROLLER_FAN_PIN to PB7 I get the error CONTROLLER_FAN_PIN cannot be FAN_PIN. How do I tell Marlin I don't need a part cooling fan? Or should I just set the laser cooling fan to FAN_PIN somehow?

Config files attached for reference.

add #define FAN_PIN -1 to your Configuration.h
Note this is #define FAN0_PIN -1 in more up to date code.

Thank you for the reply. For some reason setting FAN_PIN -1 in configuration.h gave me errors in stepper.cpp (error: 'class Planner' has no member named 'sync_fan_speeds' AND error: 'block_t' {aka 'struct PlannerBlock'} has no member named 'fan_speed'). Instead I set FAN_PIN 0 and it appears to be working. I appreciate the help.

you have #define LASER_SYNCHRONOUS_M106_M107


Which is fan_pin control, your not using a laser on the fan_pins so disable this.

Setting fan_pin to 0 conflicts with PA0 ie E1_DIAG_PIN