zsh: (anon):trap:25: undefined signal: INT when using oh my ZSH and an PSA

[patricus3]

I'm getting (anon):trap:25: undefined signal: INT after restarting zsh after install of oh my zsh on this port, also @jart sorry, misunderstandings happen.

[ahgamut]

This is likely related to #22 -- at build time zsh does some extra checks to find out the signals provided by the host system, which needs to be patched to ensure all this works.