merge sayamindu's old repository with my new one

Makefile

@@ -1,13 +1,19 @@
 #!/usr/bin/make
+.RECIPEPREFIX +=
+SIGIMAGE = figures/signature.png.gpg
 
 all: $(patsubst %.tex,%.pdf,$(wildcard *.tex)) 
 
-%.pdf: %.tex 
+%.pdf: update-sig %.tex 
 	latexmk -f -xelatex $<
 
+<update-sig:
+    gpg --yes --output figures/signature.png --decrypt $(SIGIMAGE)
+
 clean: 
 	latexmk -C *.tex
-	rm -f *.tmp *.run.xml
+	$(RM) -f *.tmp *.run.xml
+	$(RM) -f figures/signature.png
 
 viewpdf: all
 	evince *.pdf
@@ -15,4 +21,3 @@ viewpdf: all
 pdf: all
 
 .PHONY: clean all
-