Don't know why, but ar is running in the wrong directory on alpine.

--- old/lib/Makefile.in
+++ new/lib/Makefile.in
@@ -28,7 +28,7 @@
 	cd libltdl/ && $(MAKE)
 
 libsupp.a: $(LIB_OBJS)
-	$(AR) rc libsupp.a $(LIB_OBJS)
+	cd .libs && $(AR) rc ../libsupp.a $(LIB_OBJS)
 	$(RANLIB) libsupp.a
 
 lib: libsupp.a $(LIB_DEPS)