Build: Improve build.conf.example

build.conf.example

@@ -1,13 +1,14 @@
-# Build config
-# also, infos for the build system about the dev environment
+# Dev environment build config
+# This is a template, make a local copy called 'build.conf',
+# remove this line, and tweak the values as you develop
 
-# TARGET sets the program to compile and flash
-# the name of the main cxx file without the prefix 'main_'
-TARGET?=blink
-#TARGET?=testtone
+# The program to compile and flash
+# the name of the main cxx file without the suffix
 
+TARGET ?= main_blink
 DEBUG ?= 0
 
-# Daisy dependencies relative to dir 'src'
+# dependencies relative to dir 'src'
 LIBDAISY_DIR ?= ../../heck_libDaisy
 DAISYSP_DIR ?= ../../heck_DaisySP
+