if ($0 == "DOS"         && "'$os'" != "DOS")               { next; }

		if ($0 == "HAIKU"       && "'$os'" != "HAIKU")             { next; }

		if ($0 == "WIN32"       && "'$os'" != "MINGW" &&

		                 "'$os'" != "CYGWIN" && "'$os'" != "MSVC") { next; }

		if ($0 == "MSVC"        && "'$os'" != "MSVC")              { next; }

		if ($0 == "DIRECTMUSIC" && "'$with_direct_music'" == "0")  { next; }

		if ($0 == "FLUIDSYNTH"  && "'$fluidsynth'" == "" )         { next; }

		if ($0 == "HAVE_THREAD" && "'$with_threads'" == "0")       { next; }

		if ($0 == "SSE"         && "'$with_sse'" != "1")           { next; }

		skip += 1;