building bitcoin 0.21.0 from source fails on freebsd 11

[lvnilesh]

following this instruction

https://github.com/seth586/guides/blob/master/FreeNAS/bitcoin/extras/compile_bitcoind.md

# ./autogen.sh
autom4te-2.69: need GNU m4 1.4 or later: /usr/local/bin/gm4
aclocal: error: /usr/local/bin/autom4te-2.69 failed with exit status: 1
autoreconf-2.69: aclocal failed with exit status: 1

[openoms]

v0.21.1 builds ok, see if this: #13 fixes this.

[seth586]

Try building v0.21.1 and let us know if you still have problems.

Would also be useful to know what FreeBSD version you are on & gm4 version gm4 --version