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generated by CPack  DEB generator.

# CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA
# This variable allow advanced user to add custom script to the
control.tar.gz (inside the .deb archive)
# Typical examples are:
# - conffiles
# - postinst
# - postrm
# - prerm"
# Usage:
# SET(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA
#    "${CMAKE_CURRENT_SOURCE_DIR/prerm;${CMAKE_CURRENT_SOURCE_DIR}/postrm")


Thus I would try to
SET(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA
       "/path/to/your/postinst")

where:
/path/to/your/postinst

is your custom post-installation script.

-- 
Erk