diff --git a/src/environments/groupthm/Makefile b/src/environments/groupthm/Makefile
index f15be87..3d5c5ae 100644
--- a/src/environments/groupthm/Makefile
+++ b/src/environments/groupthm/Makefile
@@ -1,18 +1,14 @@
-all: clean pdf
 
 pdf:
-	pdflatex groupthm.dtx
-	makeindex -s gind.ist groupthm.idx
-	pdflatex groupthm.dtx
+	latexmk groupthm.dtx
 
-clean: clean-sty
+full:
+	latexmk -gg groupthm.dtx
+
+clean:
 	latexmk -c groupthm.dtx
-	rm -f groupthm.hd
-	rm -f groupthm.glo
-	rm -f groupthm.pdf
 
-clean-sty:
-	rm -f groupthm.sty
-	rm -f groupthm.tdo
+clean-all:
+	latexmk -C groupthm.dtx
 
-.PHONY: pdf clean
+.PHONY: clean, clean-all