- Use our own libtool
- Link with libc++abi on arm (to access unwind symbols)

Index: configure
--- configure.orig
+++ configure
@@ -9940,7 +9940,7 @@ esac
 LIBTOOL_DEPS=$ltmain
 
 # Always use our own libtool.
-LIBTOOL='$(SHELL) $(top_builddir)/libtool'
+#LIBTOOL='$(SHELL) $(top_builddir)/libtool'
 
 
 
@@ -19725,6 +19725,12 @@ if test "x$sys_symbol_underscore" = xyes; then
 printf "%s\n" "#define SYMBOL_UNDERSCORE 1" >>confdefs.h
 
 fi
+
+case "$target" in
+    arm-*-openbsd*)
+      LDFLAGS="-lc++abi $LDFLAGS"
+    ;;
+esac
 
 FFI_EXEC_TRAMPOLINE_TABLE=0
 case "$target" in