Packages with the libffi use flag

Global definition: Enable support for Foreign Function Interface library.

app-crypt / p11-kit : Provides a standard configuration setup for installing PKCS#11

app-i18n / uim : A multilingual input method framework

dev-java / jamvm : An extremely small and specification-compliant virtual machine

gnustep-base / gnustep-base : A library of general-purpose, non-graphical Objective C objects

sys-devel / llvm : Low Level Virtual Machine