Supporting configuration settings for include and warnings

.arduino-build.conf

@@ -0,0 +1,11 @@
+# .arduino-build.conf -- Project-level build configuration
+#
+# Discovered by arduino-build.sh when it walks up from the sketch directory.
+# All paths are relative to this file's location (the project root).
+
+# Include paths -- each becomes a -I flag to the compiler
+INCLUDE_DIRS="lib/hal lib/app"
+EXTRA_BUILD_FLAGS="-Werror"
+
+# Additional compiler flags (uncomment as needed)
+# EXTRA_BUILD_FLAGS="-DDEBUG=1"