--- Makefile    2014-01-01 22:04:20.761645521 +0800
+++ Makefile.new        2014-01-01 22:01:12.409647638 +0800
@@ -12,7 +12,17 @@
 PREFIX ?= /usr
 DESTDIR ?=
 INCDIR = $(DESTDIR)$(PREFIX)/include
+
+LIBDIR = $(DESTDIR)$(PREFIX)/lib
+# on x86_64, we might have /usr/lib64 directory instead of /usr/lib
+MACHINE := $(shell uname -m)
+ifeq ($(MACHINE), x86_64)
+ifeq (,$(wildcard $(LIBDIR)))
+LIBDIR = $(DESTDIR)$(PREFIX)/lib64
+else
 LIBDIR = $(DESTDIR)$(PREFIX)/lib
+endif
+endif
 
 INSTALL_DATA ?= install -m0644
 INSTALL_LIBRARY ?= install -m0755