Hi all : there is a problem on libguestfs-1.29.40 after command :make check libguestfs: error: mkfs_btrfs: /dev/vda1: device /dev/vda1 is too small (must be at least 256 MB) FAIL: test_btrfs_image_0 3/515 test_btrfstune_enable_skinny_metadata_extent_refs_0 libguestfs: error: btrfstune_enable_skinny_metadata_extent_refs: /dev/vda1: btrfstune: invalid option -- 'x' usage: btrfstune [options] device -S value enable/disable seeding FAIL: test_btrfstune_enable_skinny_metadata_extent_refs_0 4/515 test_btrfstune_enable_extended_inode_refs_0 libguestfs: error: btrfstune_enable_extended_inode_refs: /dev/vda1: btrfstune: invalid option -- 'r' usage: btrfstune [options] device -S value enable/disable seeding FAIL: test_btrfstune_enable_extended_inode_refs_0 5/515 test_btrfstune_seeding_0 libguestfs: error: btrfstune_seeding: /dev/vda1: btrfstune: invalid option -- 'f' I found two patch https://www.redhat.com/archives/libguestfs/2012-May/msg00018.htmlvirt-make-f... Fix estimation when making btrfs (but there is no virt-make-fs under tools) https://www.redhat.com/archives/libguestfs/2012-April/msg00008.html New API: mkfs-btrfs for creating btrfs filesystems ( It was patched in libguestfs-1.29.40) It seems stupid, but I can't find the answer, I am sorry