[gentoo-user] app-text/build-docbook-catalog-1.19 | "there are files installed outside the prefix"

This error seems to be from the ebuild script side of things, as far as my quick research into the error messageI'm on a PowerBook G4, with Gentoo Prefix installed. Is the problem the trailing "/" in the DESTDIR command?

Emerging (3 of 19) app-text/build-docbook-catalog-1.19

* build-docbook-catalog-1.19.tar.xz RMD160 SHA1 SHA256 size ;-) ... [ ok ]

Unpacking source...
Unpacking build-docbook-catalog-1.19.tar.xz to /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/work
Source unpacked in /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/work
Preparing source in /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/work/build-docbook-catalog-1.19 ...
Source prepared.
Configuring source in /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/work/build-docbook-catalog-1.19 ...
Source configured.
Compiling source in /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/work/build-docbook-catalog-1.19 ...

make
make: Nothing to be done for `all'.

Source compiled.
Test phase [not enabled]: app-text/build-docbook-catalog-1.19

Install build-docbook-catalog-1.19 into /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/image/ category app-text

make DESTDIR=/opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/image/ install
mkdir -p /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/image//etc/xml /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/image//usr/sbin
touch /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/image//etc/xml/.keep
install -m 755 build-docbook-catalog /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/image//usr/sbin

Completed installing build-docbook-catalog-1.19 into /opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/image/

ecompressdir: bzip2 -9 /usr/share/doc
* QA Notice: the following files are outside of the prefix:
* /etc
* /etc/xml
* /etc/xml/.keep
* /usr
* /usr/sbin
* /usr/sbin/build-docbook-catalog
* ERROR: app-text/build-docbook-catalog-1.19 failed:
* Aborting due to QA concerns: there are files installed outside the prefix
*
* Call stack:
* misc-functions.sh, line 1895: Called install_qa_check
* misc-functions.sh, line 253: Called install_qa_check_prefix
* misc-functions.sh, line 908: Called die
* The specific snippet of code:
* die "Aborting due to QA concerns: there are files installed outside the prefix"
*
* If you need support, post the output of 'emerge --info =app-text/build-docbook-catalog-1.19',
* the complete build log and the output of 'emerge -pqv =app-text/build-docbook-catalog-1.19'.
* The complete build log is located at '/opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/temp/build.log'.
* The ebuild environment file is located at '/opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/temp/environment'.
* Working directory: '/opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/image'
* S: '/opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/work/build-docbook-catalog-1.19'
!!! post install failed; exiting.

Failed to emerge app-text/build-docbook-catalog-1.19, Log file:

'/opt/Gentoo/var/tmp/portage/app-text/build-docbook-catalog-1.19/temp/build.log'