Re: [PATCH 12/13] Build in merge

Absolutely. And also color.ui. The following patch should do the trick:

diff --git a/builtin-merge.c b/builtin-merge.c
index 98adca5..cf557f7 100644
--- a/builtin-merge.c
+++ b/builtin-merge.c

@@ -7,6 +7,7 @@
  */
 
 #include "cache.h"
+#include "color.h"
 #include "parse-options.h"
 #include "builtin.h"
 #include "run-command.h"

@@ -712,6 +713,9 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
        git_config(git_merge_config, NULL);
        git_config(git_diff_ui_config, NULL);
 
+       if (diff_use_color_default == -1)
+               diff_use_color_default = git_use_color_default;
+
        argc = parse_options(argc, argv, builtin_merge_options,
                        builtin_merge_usage, 0);