diff --git a/Makefile b/Makefile
index 6634a35..301dd03 100755
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,33 @@
-# Makefile for ouexam document class
+######################################################################
+#
+# File: $Id$
+#
+# Makefile for ouexam document class.
+#
+######################################################################
 
+SHELL=/bin/sh
+
+
+.PHONY: class doc pdfdoc install tidy clean
+
+
+# Build everything.
 all: class doc
 
+
+# Build the class file only.
 class: ouexam.cls
+ouexam.cls: ouexam.dtx
+	latex ouexam.ins
+
+
+# Build the documentation only.
 doc: ouexam.dvi
 
 # only make pdfdoc if you have GhostScript and dvipdf installed
 pdfdoc: ouexam.pdf
 
-ouexam.cls: ouexam.dtx
-	latex ouexam.ins
-
 ouexam.pdf:	ouexam.dvi
 	dvipdf ouexam.dvi ouexam.pdf
 
@@ -19,5 +36,23 @@
 	latex ouexam.dtx
 	latex ouexam.dtx
 
-clean:
-	rm -f *.dvi *.tmp *.aux *.out *.log *.cls *.glo *.toc *.pdf
+
+# Install files in the appropriate locations in the texmf tree rooted at
+# $(TEXMF_INSTALL). Either define this as a shell variable or pass it as
+# command line argument, e.g., make install TEXMF_INSTALL=/usr/local/texmf.
+install:
+	mkdir -p $(TEXMF_INSTALL)/tex/latex/ouexam
+	cp ouexam.cls $(TEXMF_INSTALL)/tex/latex/ouexam
+	mkdir -p $(TEXMF_INSTALL)/doc/latex/ouexam
+	cp ouexam.dvi ouexam.dtx ouexam.ins $(TEXMF_INSTALL)/doc/latex/ouexam
+	if [ -f ouexam.pdf ]; then cp ouexam.pdf $(TEXMF_INSTALL)/doc/latex/ouexam; fi
+	texhash
+
+
+# Clean up: remove temporary files.
+tidy:
+	rm -f *.tmp *.aux *.out *.log *.glo *.toc
+
+# Clean up: remove everything except the original source.
+clean: tidy
+	rm -f *.dvi *.pdf *.cls