I just happen to have an OpenBSD 5.9 system with libffi installed
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$ uname -srm
OpenBSD 5.9 amd64
$ pkg_info -Q libffi
libffi-3.2.1p0 (installed)
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~/builds/newlisp-10.7.0 $ ./newlisp
newLISP v.10.7.0 64-bit on BSD IPv4/6 UTF-8 libffi, options: newlisp -h
> (import "libc.so.84.2" "atof" "double" "char*")
atof@F9D5A9BEB00
> (atof "3.141")
3.141