https://sources.debian.org/patches/cellwriter/1.3.6-2/fix_ftbfs.patch/
https://bugs.gentoo.org/707182
--- a/src/options.c
+++ b/src/options.c
@@ -26,9 +26,6 @@ Foundation, Inc., 51 Franklin Street, Fi
 #include <stdlib.h>
 #include <string.h>
 
-/* preprocess.c */
-int ignore_stroke_dir, ignore_stroke_num;
-
 /* cellwidget.c */
 extern int cell_width, cell_height, cell_cols_pref, cell_rows_pref,
            train_on_input, right_to_left, keyboard_enabled, xinput_enabled;
--- a/src/recognize.c
+++ b/src/recognize.c
@@ -29,7 +29,7 @@ Foundation, Inc., 51 Franklin Street, Fi
 #include "recognize.h"
 
 /* preprocess.c */
-int prep_examined;
+extern int prep_examined;
 
 void engine_prep(void);