--- buildtools/libopt.c.orig	2017-07-17 18:57:43.000000000 -0500
+++ buildtools/libopt.c	2017-07-17 18:57:50.000000000 -0500
@@ -307,6 +307,11 @@
         */
         *valid_library_p = FALSE;
         *error_p = FALSE;
+    } else if (strcmp(lastdot, ".la") == 0) {
+        /* Skip conversion of GNU libtool library files.
+        */
+        *valid_library_p = FALSE;
+        *error_p = FALSE;
     } else {
         unsigned int prefix_length;
         bool prefix_good;