diff --git a/src/Makefile.in b/src/Makefile.in
index 6588033..c610ec5 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -10,9 +10,11 @@ AR = ar -rsc
 RM = /bin/rm
 LN = /bin/ln
 OBJECT_PATH = @object_path@
-LIBDIR = @libdir@
-PREFIX = @prefix@
-INCLUDEDIR = @includedir@
+prefix = @prefix@
+exec_prefix = @exec_prefix@
+bindir = @bindir@
+libdir = @libdir@
+includedir = @includedir@
 vpath %.o $(OBJECT_PATH)
 
 OBJECTS	=	Stk.o Generator.o Noise.o Blit.o BlitSaw.o BlitSquare.o Granulate.o \
@@ -93,13 +95,13 @@ $(SHAREDLIB) : $(OBJECTS)
 	$(LN) -s @sharedname@ $(SHAREDLIB)
 
 install-headers:
-	install -d $(DESTDIR)$(PREFIX)$(INCLUDEDIR)/stk
-	cp -R ../include/*.h $(DESTDIR)$(PREFIX)$(INCLUDEDIR)/stk
+	install -d $(DESTDIR)$(includedir)/stk
+	cp -R ../include/*.h $(DESTDIR)$(includedir)/stk
 
 install: $(SHAREDLIB) install-headers
-	install -d $(DESTDIR)$(PREFIX)$(LIBDIR)
-	install -m 644 @sharedname@ $(DESTDIR)$(PREFIX)$(LIBDIR)
-	ln -sf @sharedname@ $(DESTDIR)$(PREFIX)$(LIBDIR)/$(SHAREDLIB)
+	install -d $(DESTDIR)$(libdir)
+	install -m 644 @sharedname@ $(DESTDIR)$(libdir)
+	ln -sf @sharedname@ $(DESTDIR)$(libdir)/$(SHAREDLIB)
 
 
 $(OBJECTS) : Stk.h