--- src/Makefile.in.orig	2023-11-30 23:09:01 UTC
+++ src/Makefile.in
@@ -90,7 +90,7 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
-@WITH_GNU_LD_TRUE@am__append_1 = -Wl,--version-script=${srcdir}/libHX.map
+@WITH_GNU_LD_TRUE@am__append_1 = -Wl,--version-script=${srcdir}/libHX.map -Wl,--undefined-version
 @MINGW32_TRUE@am__append_2 = ux-file.c ux-mmap.c
 @MINGW32_TRUE@am__append_3 = -lws2_32
 check_PROGRAMS = tc-compile$(EXEEXT) tc-cast$(EXEEXT) \