**Autoconf{nbsp}≥{nbsp}2.64**, and **Autoheader{nbsp}≥{nbsp}2.50**)
* **http://www.gnu.org/software/autoconf/[GNU{nbsp}Libtool]{nbsp}≥{nbsp}2.2**
**Autoconf{nbsp}≥{nbsp}2.64**, and **Autoheader{nbsp}≥{nbsp}2.50**)
* **http://www.gnu.org/software/autoconf/[GNU{nbsp}Libtool]{nbsp}≥{nbsp}2.2**