-prefix ?= /usr/
+prefix ?= /usr
exec_prefix ?= $(prefix)
-libdir ?= $(exec_prefix)/lib64/
-datadir ?= $(prefix)/share/
-mandir ?= $(datadir)/man/
-includedir ?= $(prefix)/include/
-bindir ?= $(exec_prefix)/bin/
-PCDIR ?= $(libdir)/pkgconfig/
+libdir ?= $(exec_prefix)/lib64
+datadir ?= $(prefix)/share
+mandir ?= $(datadir)/man
+includedir ?= $(prefix)/include
+bindir ?= $(exec_prefix)/bin
+PCDIR ?= $(libdir)/pkgconfig
DESTDIR ?=
INSTALL ?= install