From eeda9c6bf83206397b5e0e003a092df723e3fcf2 Mon Sep 17 00:00:00 2001
From: andy5995 <andy400-dev@yahoo.com>
Date: Thu, 17 Jan 2019 15:52:35 -0600
Subject: [PATCH] configure.ac:expand comment for AC_USE_SYSTEM_EXTENSIONS

---
 configure.ac | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index b34ed9b924..a56d942a56 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,7 +20,11 @@ if test -n "${build}" -a -n "${target}"; then
 	GEANY_STATUS_ADD([Building Geany for], [${target}])
 fi
 
-# why do we use this?
+# If possible, enable extensions to C or Posix on hosts that normally
+# disable the extensions, typically due to standards-conformance
+# namespace issues. This should be called before any macros that run the
+# C compiler.
+# <https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Posix-Variants.html>
 AC_USE_SYSTEM_EXTENSIONS
 
 m4_ifdef([AM_PROG_AR],[AM_PROG_AR])