diff -up kbd-2.2.0/configure.ac.orig kbd-2.2.0/configure.ac
--- kbd-2.2.0/configure.ac.orig	2019-08-28 11:07:00.787173606 +0200
+++ kbd-2.2.0/configure.ac	2019-08-28 11:08:07.217317151 +0200
@@ -72,9 +72,9 @@ if test "$enable_code_coverage" = yes; t
 fi
 
 case "$GCC,$ac_cv_prog_cc_g" in
-	yes,yes) CFLAGS="-g $CC_O_LEVEL $FORTIFY_SOURCE" ;;
-	yes,)    CFLAGS="$CC_O_LEVEL $FORTIFY_SOURCE" ;;
-	   ,yes) CFLAGS="-g" ;;
+	yes,yes) CFLAGS="$CC_O_LEVEL $FORTIFY_SOURCE $CFLAGS" ;;
+	yes,)    CFLAGS="$CC_O_LEVEL $FORTIFY_SOURCE $CFLAGS" ;;
+	   ,yes) CFLAGS="$CFLAGS" ;;
 esac
 
 CC_CHECK_CFLAGS_APPEND([\
