postinst is in gcc-doc 4:4.6.3-1ubuntu5.
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 | #! /bin/sh -e
install-info --quiet \
--section "Development" "Development" \
--menuentry=gcc \
--description="The GNU Compiler Collection" \
/usr/share/info/gcc.info.gz
install-info --quiet \
--section "Development" "Development" \
--menuentry=gccint \
--description="Internals of the GNU Compiler Collection" \
/usr/share/info/gccint.info.gz
exit 0
|