#define MAXPARENT (16)
static unsigned char parent_sha1[MAXPARENT][20];
-static char *commit_tree_usage = "git-commit-tree <sha1> [-p <sha1>]* < changelog";
+static const char commit_tree_usage[] = "git-commit-tree <sha1> [-p <sha1>]* < changelog";
static int new_parent(int idx)
{