Bug 191874

Tetex, more specifically ptex, won't build in mock, as the system texmf path
seems to be used.

/bin/sh ./mkconf ../../kpathsea/texmf.cnf > texmf.cnf
TEXMFCNF=. make progname=ptex files="ptex.tex min10.tfm" prereq-check
make[1]: Entering directory
`/builddir/build/BUILD/tetex-src-3.0/texk/web2c/ptex-src-3.1.9'
TEXMFCNF=. ../../kpathsea/kpsewhich --progname=ptex ptex.tex min10.tfm
>/dev/null || make prereq-lose >/dev/null
You seem to be missing input files necessary to make the
basic formats (some or all of: ptex.tex min10.tfm).
Perhaps you've defined the default paths incorrectly, or
perhaps you have environment variables set pointing
to an incorrect location.  See ../kpathsea/BUGS.

If you simply do not have the files, you can
retrieve a minimal set of input files from
ftp://ftp.tug.org/tex/lib.tar.gz, mirrored on
CTAN hosts in systems/web2c.
make[2]: *** [prereq-lose] Error 1
make[1]: *** [prereq-check] Error 2
make[1]: Leaving directory
`/builddir/build/BUILD/tetex-src-3.0/texk/web2c/ptex-src-3.1.9'
make: *** [ptex-euc.fmt] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.8037 (%build)

Instead of ../../../texmf /usr/share/texmf is used, which subsequently fails.
I tried adding
--path=../../../texmf/ptex/plain/base/:../../../texmf/fonts/tfm/ptex to the
kpsewhich command, which then fails with the following:

TEXMFCNF=. make progname=ptex files="ptex.tex min10.tfm" prereq-check
make[1]: Entering directory
`/builddir/build/BUILD/tetex-src-3.0/texk/web2c/ptex-src-3.1.9'
TEXMFCNF=. ../../kpathsea/kpsewhich --progname=ptex
--path=../../../texmf/ptex/plain/base/:../../../texmf/fonts/tfm/ptex ptex.tex
min10.tfm >/dev/null || make prereq-lose >/dev/null
make[1]: Leaving directory
`/builddir/build/BUILD/tetex-src-3.0/texk/web2c/ptex-src-3.1.9'
TEXMFCNF=. ./ptex --ini --kanji=euc --progname=ptex --jobname=ptex-euc \\input
ptex.tex \\dump </dev/null
This is pTeX, Version 3.141592-p3.1.9 (euc) (Web2C 7.5.4) (INITEX)
! I can't find file `ptex.tex'.
<*> \input ptex.tex
                    \dump
Please type another input file name:
! Emergency stop.
<*> \input ptex.tex
                    \dump
No pages of output.
Transcript written on texput.log.
make: *** [ptex-euc.fmt] Error 1

The correct solution would be, to override the definitions of texmf.cnf somehow,
but as my knowledge of the tex buildprocess is limited, I couldn't find a
working way.