From 6627f1c1d8acc2d53a9502a096123c0163bf731a Mon Sep 17 00:00:00 2001
From: Sergey Poznyakoff <gray@gnu.org>
Date: Thu, 17 May 2018 16:48:38 +0300
Subject: Select default PID source as suggested in the docs.

---
 configure.ac | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/configure.ac b/configure.ac
index 8cf75a7..5d36092 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,6 +42,14 @@ GRECS_SETUP(grecs, [all-parsers])
 AM_CONDITIONAL([COND_PCRE],
   [test "$ac_cv_header_pcre_h" = yes && test "$ac_cv_lib_pcre_main" = yes])
 
+if test -f /proc/$$/cmdline; then
+  DEFAULT_PID_SOURCE='"PROC"'
+else
+  DEFAULT_PID_SOURCE='"PS"'
+fi
+AC_DEFINE_UNQUOTED(DEFAULT_PID_SOURCE,$DEFAULT_PID_SOURCE,
+ [Default PID source])
+  
 AC_CONFIG_FILES([Makefile
                  src/Makefile])
 
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