# File lib/mkrf/availability.rb, line 98 def has_header?(header, *paths) if header_already_loaded?(header) || header_can_link?(header) || header_found_in_paths?(header, paths) defines << format("HAVE_%s", header.tr("a-z./\055", "A-Z___")) return true end logger.warn "Header not found: #{header}" return false end