@andy5995 commented on this pull request.

In 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>

P.S. My guess is that the macro isn't needed, or not being utilized atm. I don't see that _GNU_SOURCE is being defined with a flag during compiling, nor is the -std=gnu flag being used.

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