Makefile: Improve compiler header dependency check

diff --git a/merge-recursive.c b/merge-recursive.c
index db9ba19ddf94fec3a5cfff450b35f5bb7b46c35e..0cc1e6fc1498e9fc51c9e382aee6a20e439a4ef0 100644 (file)
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1759,6 +1759,8 @@ int parse_merge_opt(struct merge_options *o, const char *s)
                o->subtree_shift = s + strlen("subtree=");
        else if (!strcmp(s, "patience"))
                o->xdl_opts |= XDF_PATIENCE_DIFF;
+       else if (!strcmp(s, "histogram"))
+               o->xdl_opts |= XDF_HISTOGRAM_DIFF;
        else if (!strcmp(s, "ignore-space-change"))
                o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
        else if (!strcmp(s, "ignore-all-space"))