/** Locates a source file. If a file is found but no target is associated
with it, a new package-less target is created with the appropriate tool. If
use_syspath is true, the system path reported by the tool is also searched. */
/** Locates a source file. If a file is found but no target is associated
with it, a new package-less target is created with the appropriate tool. If
use_syspath is true, the system path reported by the tool is also searched. */