preinst is in libopenmpi-dev 1.6.5-8.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #!/bin/sh
set -e
# mpicc seemed to be used as a master alternative by some MPI package. But
# currently, all MPI packages have the mpicc alternative installed as a slave
# link. We remove the link here in order to resolve bugs #531184 and #532910.
update-alternatives --quiet --remove-all mpicc >/dev/null 2>&1 || true
update-alternatives --quiet --remove-all mpiCC >/dev/null 2>&1 || true
exit 0
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