Hello!

We want to compile xserver_xorg and get an error:
lcc: "../../dix/main.c", line 133: error: nonstandard number of parameters for
          "main", expected zero or two parameters [-Werror=main]
  main(int argc, char *argv[], char *envp[])

It happens due to conftest and real program difference.
While configure script checks if $CC supports -Werror=main option the conftest program is:

int i;
int
main ()
{

  ;
  return 0;
}

The main function in conftest has no parameters. However main function in dix/main.c has 3 parameters:

dix_main(int argc, char *argv[], char *envp[])

The difference leads to compilation error:

lcc: "../../dix/main.c", line 133: error: nonstandard number of parameters for
          "main", expected zero or two parameters [-Werror=main]
  main(int argc, char *argv[], char *envp[])

We can avoid the error by pass --disable-selective-werror to configure script. But  aclocal.m4 file contains recommendation: 
"You have chosen not to turn some select compiler warnings into errors.  This should not be necessary.  Please report why you needed to do so in a bug report at $PACKAGE_BUGREPORT". So you can see the bug.