/usr/share/sgml/docbook/stylesheet/dsssl/modular/images/Make.images is in docbook-dsssl 1.79-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | GIF := $(wildcard *.gif)
EPS := $(GIF:.gif=.eps)
PDF := $(GIF:.gif=.pdf)
%.eps: %.gif
convert $< $@
%.pdf: %.eps
epstopdf --outfile=$@ $<
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