libffi 3.5.1
=
https://github.com/libffi/libffi/releases/download/v3.5.1/libffi-3.5.1.tar.gz

``` sh *** build ***
./configure --prefix=/pkg/gnu/libffi --libdir=/pkg/gnu/libffi/lib --disable-multi-os-directory
make -j$(nproc)
make install
```