--- htick/Makefile.orig	2010-04-20 19:10:55.000000000 +0000
+++ htick/Makefile	2014-08-02 22:22:28.572741488 +0000
@@ -45,6 +45,12 @@ CDEFS=-D$(OSTYPE) $(ADDCDEFS)
 
 all: $(OBJS) htick$(EXE)
 
+doc:
+	-cd doc; $(MAKE) all
+
+install-doc:
+	-cd doc; $(MAKE) install
+
 %$(_OBJ): $(SRC_DIR)%.c
 	$(CC) $(CFLAGS) $(CDEFS) $(SRC_DIR)$*.c