What’s the error?

ffi-lib: could not load foreign library path: [all opened] system error: unknown error context...: body of "/data/data/com.termux/files/home/rkt/share/racket/collects/openssl/mzssl.rkt" body of "/data/data/com.termux/files/home/rkt/share/racket/collects/setup/main.rkt"

Step one is to check that libffi is installed on your system. https://sourceware.org/libffi/\|https://sourceware.org/libffi/

Checking availability of current mirror: ok
Get:1 <https://termux.librehat.com/apt/termux-main\|https://termux.librehat.com/apt/termux-main> stable InRelease [14.0 kB]
Hit:2 <https://packages.termux.org/apt/termux-games\|https://packages.termux.org/apt/termux-games> games InRelease
Hit:3 <https://packages.termux.org/apt/termux-science\|https://packages.termux.org/apt/termux-science> science InRelease
Get:4 <https://termux.librehat.com/apt/termux-main\|https://termux.librehat.com/apt/termux-main> stable/main aarch64 Packages [260 kB]
Fetched 274 kB in 4s (66.5 kB/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
1 package can be upgraded. Run 'apt list --upgradable' to see it.
Sorting... Done
Full Text Search... Done
libffi/stable,now 3.4.2 aarch64 [installed,automatic]
  Library providing a portable, high level programming interface to various calling conventions

libffi-static/stable 3.4.2 aarch64
  Static libraries for libffi

It looks like libffi is already installed.

Hmm.