在Ubuntu下，解决办法是：
sudo apt-get install libtool
详见：【已解决】Ubuntu下去配置crosstool-ng时出现：configure: error: could not find GNU libtool >= 1.5.26
 |  |  |
| 5.1.1.5. configure: error: could not find GNU awk |  | 5.1.1.7. configure: error: could not find GNU automake >= 1.10 |
