How to install Calculix on an M1 Mac

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Calculix consists of ccx and cgx. ccx can be installed through homebrew cgx can be installed following the 2015 Mac installation manual (opens in a new tab) with some additions First I was getting this error:

parser.c:91:3: error: implicit declaration of function 'DrawCommandLine' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  DrawCommandLine(keystroke, strlen(keystroke) + *curshft);

The solution to this was to change the first line of parser.c:

#include <cgx.h>
/*#include <extUtil.h>

As well as to correct the pickfunktions.c file on line 4597:

return;

This still gave me the following error:

ld: library not found for -lSystem
collect2: error: ld returned 1 exit status
make: *** [cgx] Error 1

Which was resolved by adding the following to the LFLAGS section in the Makefile:

-L /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib \```