default or selected kernelversion does not have config value CONFIG_OSF4_COMPAT.
Result is shown for kernelversion 6.9.5

OSF/1 v4 readv/writev compatibility

configname: CONFIG_OSF4_COMPAT

Linux Kernel Configuration
└─>Executable file formats
└─>OSF/1 v4 readv/writev compatibility
In linux kernel since version 2.6.12  
Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
with v4 shared libraries freely available from Compaq. If you're
going to use shared libraries from Tru64 version 5.0 or later, say N.