-void gz_uncompress OF((gzFile in, FILE *out));
-void file_compress OF((char *file, char *mode));
-void file_uncompress OF((char *file));
-int main OF((int argc, char *argv[]));
+void gz_uncompress _Z_OF((gzFile in, FILE *out));
+void file_compress _Z_OF((char *file, char *mode));
+void file_uncompress _Z_OF((char *file));
+int main _Z_OF((int argc, char *argv[]));