$NetBSD: patch-Makefile.am,v 1.1 2021/03/01 09:48:40 nia Exp $

_POSIX_C_SOURCE=200112L or higher is needed for strdup.

--- Makefile.am.orig	2020-10-10 13:03:09.000000000 +0000
+++ Makefile.am
@@ -436,7 +436,7 @@ src/ComUtil/symbols.cc src/ComUtil/txtut
 src/ComUtil/util.cc src/ComUtil/xdll.cc
 
 libComUtil_la_CPPFLAGS = \
- -D_POSIX_C_SOURCE $(IVSTD_INCLUDES)
+ -D_POSIX_C_SOURCE=200112L $(IVSTD_INCLUDES)
 
 libComUtilPART1_la_SOURCES = src/ComUtil/errsys.cc
 
@@ -447,7 +447,7 @@ libComUtilPART1_la_SOURCES = src/ComUtil
 libComUtilPART1_la_CPPFLAGS = \
  -DABSLIBALLDIR=\"$(pkgdatadir)/\" \
  -DRELLIBALLDIR=\"lib/$(PACKAGE)/\" \
- -D_POSIX_C_SOURCE $(IVSTD_INCLUDES)
+ -D_POSIX_C_SOURCE=200112L $(IVSTD_INCLUDES)
 
 # NOTE: inconsistency in whether ABSLIBALLDIR has a trailing slash