Add "echo".  Has -n and -e (but not \0123 yet).
diff --git a/lib/lib.h b/lib/lib.h
index 5ac8e10..e343fd1 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -38,6 +38,9 @@
 void *xstrndup(char *s, size_t n);
 void *xstrdup(char *s);
 char *xmsprintf(char *format, ...);
+void xprintf(char *format, ...);
+void xputc(char c);
+void xflush(void);
 void xexec(char **argv);
 void xaccess(char *path, int flags);
 int xcreate(char *path, int flags, int mode);