--- a/make/update-rules.sh	Sun May 24 12:18:44 2026 +0200
+++ b/make/update-rules.sh	Wed Aug 26 16:03:54 2026 +0200
@@ -47,6 +47,7 @@
 sed '/FORCE:/q' Makefile.old > Makefile
 echo >> Makefile
 for file in `ls *.c` ; do
+  if [ "$file" = "test_header_only.c" ]; then continue; fi
   "$CC" -MT "$target/${file%.c}\$(OBJ_EXT)" -MM $CFLAGS $extra_flags "$file"
   printf '\t@echo "Compiling $<"\n'
   printf '\t$(CC) -o $@ $(CFLAGS) %s -c $<\n\n' "$extra_flags"