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/usr/lib/ecl-15.3.7/rt.asd is in ecl 15.3.7+dfsg1-2+deb9u1.

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(defsystem "rt" :class asdf::prebuilt-system
	:lib #P"SYS:LIBRT.A"
	:depends-on NIL
	:components ((:compiled-file "rt" :pathname #P"SYS:RT.FAS")))