From eea0337c7d6bddea9e10c2128beb4cea046c3b79 Mon Sep 17 00:00:00 2001
From: Julien Schueller <schueller@phimeca.com>
Date: Fri, 17 Jul 2020 08:58:01 +0200
Subject: centos5: Fix FTBFS with strdup

Since commit f034b0f663 (CMake compilation: do not use compiler
extensions, 2020-03-14, v3.18.0-rc1~494^2) we need to explicitly enable
availability of `strdup`.

Fixes: #20971
---
 Source/cmStandardLexer.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Source/cmStandardLexer.h b/Source/cmStandardLexer.h
index cc67ac2..e0b2116 100644
--- a/Source/cmStandardLexer.h
+++ b/Source/cmStandardLexer.h
@@ -3,6 +3,10 @@
 #ifndef cmStandardLexer_h
 #define cmStandardLexer_h
 
+#if defined(__linux)
+/* Needed for glibc < 2.12 */
+#  define _XOPEN_SOURCE 600
+#endif
 #if !defined(_WIN32) && !defined(__sun)
 /* POSIX APIs are needed */
 #  define _POSIX_C_SOURCE 200809L
-- 
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