$NetBSD: patch-src_Makevars,v 1.2 2026/07/13 14:04:56 mef Exp $

symbol backtrace_symbols is defined in /usr/lib/libexecinfo

--- src/Makevars.orig	2023-02-14 22:58:59.000000000 +0900
+++ src/Makevars	2026-07-13 23:00:17.942690323 +0900
@@ -2,3 +2,4 @@
 
 PKG_CPPFLAGS = -I../inst/include -I.
 PKG_LIBS = $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
+@@PKG_LIBS@@
