/var/tmp/portage/sys-apps/portage-2.1.7.13/temp/environment: line 5: BASHOPTS: readonly variable
 * 
 * ERROR: sys-apps/portage-2.1.7.13 failed.
 * Call stack:
 *               ebuild.sh, line 1776:  Called die
 * The specific snippet of code:
 *   	preprocess_ebuild_env || \
 *   		die "error processing environment"
 *  The die message:
 *   error processing environment
 * 
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/tmp/portage/sys-apps/portage-2.1.7.13/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sys-apps/portage-2.1.7.13/temp/environment'.
 *