question in install gcc on SCO unix 3.2v5.0.4

["wangji" <wangji at mail dot east dot net dot cn>]

I downloaded gcc-2.95.3 from gnu.I want to use it in my PC with SCO UNIX 3.2v5.0.4.
On my PC , I have installed SCO development system . It uses cc/CC to compile c/c++ program.
After running ./configure , I run make .
While compiling bad.c , cc reports  that "-W-Wall" option is error.
So I delete "-W -Wall" option in Makefile .
And then proty.h(Maybe a other name like it) compiles error,
Compile programm reports the Line :#ERROR: "..." --- error,
And there is another program error in the Line : typedef long long something .
I think that there is something not supported by SCO UNIX compiler,and I also think
there only have two ways to solve the problem:
1.change the program
2.get a old version gcc binary to install , and use it to compile the program again

 

And so can anyone help me ?