# built in any order. All DIRS are built in order before PARALLEL_DIRS are
# built, which are then built in any order.
#
-# 4. Source - If specified, this sets the source code filenames. If this
+# 4. SOURCES - If specified, this sets the source code filenames. If this
# is not set, it defaults to be all of the .cpp, .c, .y, and .l files
-# in the current directory. Also, if you want to build files in addition
-# to the local files, you can use the ExtraSource variable
+# in the current directory.
#
# 5. SourceDir - If specified, this specifies a directory that the source files
# are in, if they are not in the current directory. This should include a