postinst is in libgd2-xpm-dev 2.1.0-3ubuntu0.11.
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 15 | #!/bin/sh
set -e
DOCDIR=/usr/share/doc/libgd2-xpm-dev
DOCLINK=libgd-dev
if [ -d $DOCDIR ] && [ ! -L $DOCDIR ]; then
rmdir $DOCDIR
ln -s $DOCLINK $DOCDIR
fi
exit 0
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