config.status: creating Makefile.inc     
config.status: creating Documentation/Makefile                                   
config.status: creating libbtrfs/version.h                                       
config.status: creating libbtrfsutil/libbtrfsutil.pc                             
config.status: error: cannot find input file: `include/config.h.in'

!!! Please attach the following file when seeking support:
!!! /var/tmp/portage/sys-fs/btrfs-progs-6.2/work/btrfs-progs-v6.2/config.log