There are examples in the readme... unless you mean build it (just type make with libsecp256k1 installed)
Discussion
yes， I mean build it. I installed libsecp256k1-dev on my debian successfully, but when make, get this error
```
nostril.c:202:9: error: too few arguments to function ‘secp256k1_schnorrsig_sign’
202 | return secp256k1_schnorrsig_sign(ctx, sig, id, &key->pair, aux);
ugh looks like your distro has an older version of libsecp256k1... 😑
Maybe I should just build libsecp256k1 in-tree 🤔