+# to use encrypted signatures files, add "figures/signature.pdf" (no
+# quotes) right before the first $( in the following line:
+all: $(patsubst %.tex,%.pdf,$(wildcard *.tex))
+
+figures/signature.pdf:
+ gpg --yes --output $(DEC_SIGIMAGE) --decrypt $(ENC_SIGIMAGE)
+
+%.pdf: %.tex