$NetBSD: patch-src_Makevars,v 1.1 2026/05/26 21:19:47 mef Exp $

symbol backtrace_symbols is defined in /usr/lib/libexecinfo

--- src/Makevars.orig	2025-12-30 08:54:49.000000000 +0900
+++ src/Makevars	2026-05-27 06:13:20.451270591 +0900
@@ -24,3 +24,11 @@ PKG_SOURCES = \
 PKG_OBJECTS = $(PKG_SOURECES:.cpp=.o)
 
 $(SHLIB): $(CCTZ_OBJECTS) $(PKG_OBJECTS)
+
+UNAME := $(shell uname)
+
+ifneq ($(UNAME), Linux)
+ifneq ($(UNAME), SunOS)
+PKG_LIBS += -lexecinfo
+endif
+endif
