Created attachment 771707 [details] build.log from sys-fs/btrfs-progs-5.16.2 with configure: error: Package requirements (ext2fs) were not met: sys-fs/btrfs-progs-5.16.2 checking for EXT2FS... no configure: error: Package requirements (ext2fs) were not met: Package 'ext2fs', required by 'virtual:world', not found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables EXT2FS_CFLAGS and EXT2FS_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details.
Sorry, I didn't realize that it is the same as https://bugs.gentoo.org/837668 since I used USE="tools" only temporary and e2fsprogs got recompiled without tools. Imho this can be closed.