In commit f3a99e81e997cf0d8db47056b36ca2c2e3beee8f the use of an autoconf macro -- https://www.gnu.org/software/autoconf-archive/ax_ext.html -- was deleted and replaced with an in-house solution.
In commit f3a99e81e997cf0 d8db47056b36ca2 c2e3beee8f the use of an autoconf macro -- https:/ /www.gnu. org/software/ autoconf- archive/ ax_ext. html -- was deleted and replaced with an in-house solution.