$NetBSD: patch-src_Makevars,v 1.2 2026/06/13 11:42:26 mef Exp $

- The Problem is:
  RcppEigen.so: Undefined PLT symbol "backtrace_symbols" (symnum = 108)

- The symbol "backtrace_symbols" is defined in /usr/lib/libexecinfo
  at *BSD OS

- R package does not honor LIBS+= parameter, due to real build is done
  at (pkgsrc) install stage

- Neither bmake (.if eq ... .endif) nor gmake ( ifneq .. endif) does work
  in src/Makevars

- So the condition branch will be done at SUBST mechanism

--- src/Makevars.orig	2026-06-10 22:22:14.382476281 +0900
+++ src/Makevars	2026-06-10 22:23:13.868242528 +0900
@@ -1,6 +1,7 @@
 PKG_CPPFLAGS = -Iunix -I.
 PKG_CFLAGS = $(C_VISIBILITY)
 PKG_CXXFLAGS = $(CXX_VISIBILITY)
+@@PKG_LIBS@@
 
 SOURCES = cpp11.cpp XlsWorkBook.cpp XlsxWorkBook.cpp zip.cpp Read.cpp
 OBJECTS = $(SOURCES:.cpp=.o) cran.o libxls/xlstool.o libxls/endian.o libxls/ole.o libxls/xls.o libxls/locale.o
