+dnl Enable 'debug' command.
+AC_ARG_ENABLE([debug-command],
+ [AS_HELP_STRING([--enable-debug-command], [enable the 'debug' command])],
+ [AC_DEFINE_UNQUOTED([ENABLE_DEBUG_COMMAND],[1],[Enable the 'debug' command])],
+ [])
+
+dnl For strchrnul(3), asprintf(3), futimens(2) and getline(3).
+AC_GNU_SOURCE
+