mergetool--lib: improve show_tool_help() output

diff --git a/diff.c b/diff.c
index 32142dba64e0a6e926101c38b6efd95d21e0dc82..35d3f073859acf66dbd38c6096c0cc47bd26b6e2 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -25,7 +25,7 @@
 static int diff_detect_rename_default;
 static int diff_rename_limit_default = 400;
 static int diff_suppress_blank_empty;
-int diff_use_color_default = -1;
+static int diff_use_color_default = -1;
 static const char *diff_word_regex_cfg;
 static const char *external_diff_cmd_cfg;
 int diff_auto_refresh_index = 1;