"You don't have ANSI C header files." compiling error on Ubuntu

[foote-darrell]

I had followed the steps listed on the SheepShaver site to compile. It all went well until the last step with running "make".

Configuration done. Now type "make".
darrell@darrell-Lenovo-H430:~/macemu/SheepShaver/src/Unix$ make
g++ -I../kpx_cpu/include -I../kpx_cpu/src -DUSE_JIT -I../include -I. -I../CrossPlatform -I../slirp -DHAVE_CONFIG_H -D_REENTRANT -DDATADIR=\"/usr/local/share/SheepShaver\" -g -O2   -c ../main.cpp -o obj/main.o
In file included from ../main.cpp:21:
./sysdeps.h:32:2: error: #error "You don't have ANSI C header files."
   32 | #error "You don't have ANSI C header files."
      |  ^~~~~
make: *** [Makefile:200: obj/main.o] Error 1
darrell@darrell-Lenovo-H430:~/macemu/SheepShaver/src/Unix$

Attached is the entire session. How ought I resolve this?
BuildingSheepshaver.zip