RuntimeError: Package 'libelf-dev': Could not find aport, and could not find this package in any APKINDEX!

I've been compiling custom kernels all day but just now I've stumbled upon the error message in the title. I've tried everything I know in order to try to get rid of it as it prevents pmbootstrap install from completing. I've looked into it and it seems libelf-dev is a hard dependancy of the Linux kernel and it doesn't appear to be in Alpine's repos. log.txt