default or selected kernelversion does not have config value CONFIG_GPIB_PC2.
Result is shown for kernelversion 6.6.75

PC2 PC2a

modulename: pc2_gpib.ko

configname: CONFIG_GPIB_PC2

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Linux GPIB drivers
└─>PC2 PC2a
In linux kernel since version 6.13 (release Date: 2025-01-19)  
Enable support for pc2 and pc2a compatible adapters
Capital Equipment Corporation PC-488
CONTEC GP-IB(PC)
Hameg HO80
Iotech GP488B
Keithly MBC-488
Measurement Computing ISA-GPIB-PCA2
National Instruments PCII, PCIIa and PCII/IIa

To compile this driver as a module, choose M here: the module will be
called pc2_gpib

source code: