Index: build-aux/m4/buildsys.m4
==================================================================
--- build-aux/m4/buildsys.m4
+++ build-aux/m4/buildsys.m4
@@ -207,11 +207,11 @@
 		LIB_CFLAGS=''
 		LIB_LDFLAGS='-shared -Wl,--export-all-symbols'
 		LIB_LDFLAGS_INSTALL_NAME=''
 		LIB_PREFIX=''
 		LIB_SUFFIX='${LIB_MAJOR}.dll'
-		LINK_LIB='&& ${LN_S} $$out lib$${out%${LIB_SUFFIX}}.dll.a'
+		LINK_LIB='&& rm -f lib$${out%${LIB_SUFFIX}}.dll.a && ${LN_S} $$out lib$${out%${LIB_SUFFIX}}.dll.a'
 		PLUGIN_CFLAGS=''
 		PLUGIN_LDFLAGS='-shared -Wl,--export-all-symbols'
 		PLUGIN_SUFFIX='.dll'
 		LINK_PLUGIN='${LD} -o $$out ${PLUGIN_OBJS} ${PLUGIN_OBJS_EXTRA} ${PLUGIN_LDFLAGS} ${LDFLAGS} ${LIBS}'
 		INSTALL_LIB='&& ${MKDIR_P} ${DESTDIR}${bindir} && ${INSTALL} -m 755 $$i ${DESTDIR}${bindir}/$$i && ${INSTALL} -m 755 lib$${i%${LIB_SUFFIX}}.dll.a ${DESTDIR}${libdir}/lib$${i%${LIB_SUFFIX}}.dll.a'