-Always include the private pointer in the public header file. This is useful for
-files which are part of a library and you want to reserve the right to add some
-private data members without breaking binary compatibility.
+Always include the private pointer in the public header file. This is useful
+for files which are part of a library and you want to reserve the right to add
+some private data members without breaking binary compatibility.
+.TP
+.B -o --output-dir
+The directory into which output should be placed.