+dnl If any changes have been made to the public interface, that is if any
+dnl exported class, method, global or global type has been added, removed
+dnl or changed in any way, then do: WX_CURRENT += 1
+dnl
+dnl If source changes have been made that *do not* alter the public
+dnl interface then do: WX_REVISION += 1
+dnl If WX_CURRENT was incremented (as above) instead do: WX_REVISION = 0
+dnl
+dnl If any public interface was added, do: WX_AGE += 1
+dnl If any public interface was removed (or altered in a way effectively
+dnl removing the previous definition), instead do: WX_AGE = 0
+dnl
+dnl When the major or minor version numbers are incremented, all the above
+dnl variables should be reset to 0.
+dnl
+dnl The resulting library name will be of the form:
+dnl libwx_$(TOOLKIT)-$(WX_RELEASE).so.$(WX_CURRENT).$(WX_REVISION).$(WX_AGE)