+dnl Unfortunately we need to do a few things that libtool can't help us with,
+dnl so we need some knowledge of shared library filenames:
+dnl
+dnl LIB_EXT is the extension used when creating symlinks for alternate
+dnl filenames for a shared library which will be dynamically loaded
+dnl
+dnl IMP_LIB_EXT is the extension used when checking for the presence of a
+dnl the file for a shared library we wish to link with
+dnl