Autogenerate man page for mnexec.

Makefile

@@ -5,7 +5,7 @@ MN = bin/mn
 BIN = $(MN)
 PYSRC = $(MININET) $(TEST) $(EXAMPLES) $(BIN)
 MNEXEC = mnexec
-MANPAGE = mn.1
+MANPAGES = mn.1 mnexec.1
 P8IGN = E251,E201,E302,E202
 BINDIR = /usr/bin
 MANDIR = /usr/share/man/man1
@@ -13,7 +13,7 @@ MANDIR = /usr/share/man/man1
 all: codecheck test
 
 clean:
-	rm -rf build dist *.egg-info *.pyc $(MNEXEC) $(MANPAGE)
+	rm -rf build dist *.egg-info *.pyc $(MNEXEC) $(MANPAGES)
 
 codecheck: $(PYSRC)
 	-echo "Running code check"
@@ -41,12 +41,18 @@ develop: $(MNEXEC) $(MANPAGE)
 	install $(MANPAGE) $(MANDIR)
 	python setup.py develop
 
-man: $(MANPAGE)
+man: $(MANPAGES)
 
-$(MANPAGE): $(MN)
+mn.1: $(MN)
 	PYTHONPATH=. help2man -N -n "create a Mininet network." \
-    --no-discard-stderr $(MN) \
-    -o $@
+	--no-discard-stderr $< -o $@
+
+mnexec: mnexec.c $(MN) mininet/net.py
+	cc -DVERSION=\"`$(MN) --version`\" $< -o $@
+
+mnexec.1: mnexec
+	help2man -N -n "execution utility for Mininet." \
+	-h "-h" -v "-v" --no-discard-stderr ./$< -o $@ 
 
 doc: man
 	doxygen doxygen.cfg