Slirp build failure on Mac OS 11

[programmingkidx]

I tried installing slirp on Mac OS 11.1 but it failed with several errors.

Here are some of them:

:info:build ./main.p:1:5: error: second parameter of 'main' (argument array) must be of type 'char ' :info:build int main _P((int, char));

:info:build ./misc.p:4:29: error: 'void' must be the first and only parameter if specified :info:build inline void slirp_insque _P((void, void)); :info:build ^{:info:build ./misc.p:4:29: error: 'void' must be the first and only parameter if specified}

:info:build ./ppp.p:13:6: error: conflicting types for 'output' :info:build void output _P((int, u_char, int));