--- configure.ac.orig	2021-03-19 23:46:38.986463940 +0100
+++ configure.ac	2021-03-19 23:47:03.661732414 +0100
@@ -34,7 +34,7 @@
 AC_CONFIG_SRCDIR([conserver/main.c])
 AC_CONFIG_HEADER(config.h)
 
-AC_DEFINE_UNQUOTED(CONFIGINVOCATION, "$0 $@")
+AC_DEFINE_UNQUOTED(CONFIGINVOCATION, "`echo "$0" "$@"`")
 
 dnl ### Set some option defaults. ###################################
 if test -z "$CFLAGS"; then