Shellckeck found errors in one or more shellscripts provided by sys-apps/busybox. Kindly refer to the findings below and the shellcheck wiki for further details: ------------------------------------------------ script: /usr/portage/sys-apps/busybox/files/mdev/ide_links:6 for i in $media $media[0-9]* ; do error: Use braces when expanding arrays, e.g. ${array[idx]} (or ${var}[.. to quiet). (https://github.com/koalaman/shellcheck/wiki/SC1087) ------------------------------------------------ script: /usr/portage/sys-apps/busybox/files/mdev/ide_links:20 num=`ls $media[0-9]* 2>/dev/null | wc -l` error: Use braces when expanding arrays, e.g. ${array[idx]} (or ${var}[.. to quiet). (https://github.com/koalaman/shellcheck/wiki/SC1087) ------------------------------------------------ script: /usr/portage/sys-apps/busybox/files/mdev/usbdisk_link:25 elif [ -e /sys/block/*/$MDEV ] ; then ^^^^^^^^^^^^^^^^^^ error: -e doesn't work with globs. Use a for loop. (https://github.com/koalaman/shellcheck/wiki/SC2144) This is an automated bug report. Conservative settings were used to minimize false-positives but there's still a chance that the above list contains non-issues. Running shellcheck again with default settings could detect other possible issues. References: [1] this script: https://github.com/heeplr/gentoo-shellbug [2] shellcheck: https://www.shellcheck.net/