Document the variable overriding mechanism (#2296).

git-svn-id: http://lm-sensors.org/svn/lm-sensors/branches/lm-sensors-3.0.0@5107 7894878c-1315-0410-8ee3-d5d059ff63e0

CHANGES

@@ -7,6 +7,7 @@ SVN
               Don't guess the bus type from the device ID format (#2240)
               Add support for attributes in the hwmon class device (#2260)
   Makefile: No warnings about ld configuration for staged installations
+            Document the variable overriding mechanism (#2296)
   pwmconfig: Really hide errors on sysfs writes
              Deal gracefully with read-only pwm_enable files
              Warn about outputs found in automatic mode

Makefile

@@ -33,6 +33,9 @@ WARN := 1
 DEBUG := 0
 #DEBUG := 1
 
+# Note that all the installation paths below can also be set on the make
+# command line (e.g. "make PREFIX=/usr").
+
 # If you want to install at some other place then at from which you will run
 # everything, set DESTDIR to the extra prefix.
 DESTDIR :=