from <ftp://ftp.gnu.org/pub/gnu/m4/>, then GNU autoconf
(<ftp://ftp.gnu.org/pub/gnu/autoconf/>) and GNU automake
(<ftp://ftp.gnu.org/pub/gnu/automake/>). Nmh is currently using a
-minimum of autoconf 2.61 and automake 1.10.
+minimum of autoconf 2.68 and automake 1.12.
Most of the configure-related files are automatically generated.
The only files you should need to manually edit are configure.ac