--- Makefile.orig	2017-12-25 15:13:21 UTC
+++ Makefile
@@ -106,11 +106,11 @@ tags:
 
 install:
 	@echo Installing 
-	mkdir -p $(DESTDIR)$(INSTALLBINDIR)
-	mkdir -p $(DESTDIR)$(INSTALLLIBDIR)
-	mkdir -p $(DESTDIR)$(INSTALLINCDIR)
-	$(INSTALL) -m 644 include/*.h $(DESTDIR)$(INSTALLINCDIR)
-	@ $(MAKE) -C main --no-print-directory DESTDIR=$(DESTDIR) install
+	mkdir -p $(INSTALLBINDIR)
+	mkdir -p $(INSTALLLIBDIR)
+	mkdir -p $(INSTALLINCDIR)
+	$(INSTALL) -m 644 include/*.h $(INSTALLINCDIR)
+	@ $(MAKE) -C main --no-print-directory DESTDIR=${DESTDIR} install
 
 time-stamp :
 	@ echo $(PROJECT_NAME) >.time-stamp