Hello, Current webapp.eclass has two functions: webapp_postinst_txt, webapp_postupgrade_txt These are capable of accepting single file for insttructions. However there is a use (USE) case that requires supporting multiple files. Example: webapp_postinst_txt en "${FILESDIR}"/postinstall-en.txt use sdk && webapp_postinst_txt en "${FILESDIR}"/postinstall-sdk-en.txt Please consider: - cp "${2}" "${D}/${MY_APPDIR}/postinst-${1}.txt" + cat ${2}" >> "${D}/${MY_APPDIR}/postinst-${1}.txt"