And I think under Autotools (advanced users) some wordings like "build and install secp256k1" would be needed, because when I see a dependency libbitcoin/secp256k1, I clicked on it and the followed instruction given in that repo, which is
libsecp256k1 is built using autotools:
$ ./autogen.sh
$ ./configure
$ make
$ ./tests
$ sudo make install # optional
