[gentoo-portage-dev] Setting an env var for a specific ebuild

I have a problem with building Apache and have not found any answers
in searching the forums or asking.  Please let me know if this is not
the right place to ask.

Apache uses a wrapper called suexec to run setuid cgi programs.  As
part of its security check, suexec refuses to run any program whose
location does not match a compiled-in path, which by default is
.../public_html/...  Note that this path is NOT picked up from the run
time configuration, but from the build time configuration.

The net-www/apache-2.0.52-ebuild sets this build time value with an
env var:

    apache_setup_vars() {
         # Sets the USERDIR to default.
         USERDIR="public_html"

But I have always used a different USERDIR value, and do not know how
to override this.  I have resorted to editing the ebuild directly,
which means that I forget it on every upgrade and have to scratch my
head every time the first suexec program fails.  I am getting quicker
at diagnosing the problem :-)

Of course editing the ebuild is not the right way to do it, but I have
not found any way of setting an override in /etc/portage or anywhere
else.  I don't see how my own usr/local/portage ebuild would help; I'd
have to copy it from /usr/portage and edit anyway.

Is there a better way, or any way, to set a more-or-less permanent
override of this env var?

On an unrelated subject, rebuilding imagemagick found a conflicting
file, libltdl.a ...

    media-gfx/imagemagick-6.1.0.1 (/usr/lib/libltdl.a)
    sys-devel/libtool-1.5.2-r5 (/usr/lib/libltdl.a)

I have never enjoyed using bugzilla, it seems like the kind of
bureaucratic molasses that a faceless corporation would set up to show
compliance with the letter of a court order while actually
discouraging its use.  Is there any other way, or has bugzilla gotten
better in the year or two since I last tried it elsewhere?

-- 
            ... _._. ._ ._. . _._. ._. ___ .__ ._. . .__. ._ .. ._.
     Felix Finch: scarecrow repairman & rocket surgeon / felix@×××××××.com
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I've found a solution to Fermat's Last Theorem but I see I've run out of room o

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