postinst is in python-ffc 2017.2.0.post0-2.
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 16 17 18 | #!/bin/sh -e
UFC_INCLUDE_DIR=/usr/lib/python2.7/dist-packages/ffc/backends/ufc
# Make alternatives links
if [ "$1" = "configure" ]; then
  # alternative ufc.h
  update-alternatives --install /usr/include/ufc.h ufc.h ${UFC_INCLUDE_DIR}/ufc.h 150 \
    --slave /usr/include/ufc_geometry.h ufc_geometry.h ${UFC_INCLUDE_DIR}/ufc_geometry.h 
fi
# Automatically added by dh_python2:
if which pycompile >/dev/null 2>&1; then
	pycompile -p python-ffc 
fi
# End automatically added section
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