help installing gcc???

[alison waller]

I have just installed Fedora on a partition of my hard drive.

However, upon trying to compile a program (using make) that I had
downloaded (clustalw) I realized that I didn't have gcc.

I tried to install it from my second disk, but there was an error.
Now, when trying to make I get the following message.

param.h:206: error: `NULL' undeclared here (not in a function)
param.h:206: error: initializer element is not constant
param.h:206: error: (near initialization for `res_cat1[9]')
param.h:220: error: `NULL' undeclared here (not in a function)
param.h:220: error: initializer element is not constant
param.h:220: error: (near initialization for `res_cat2[11]')
param.h:302: error: `NULL' undeclared here (not in a function)
.................. then same thing with interface.c instead of param.h

I cannot install it from the disk for some reason.  I have also tried
using an rpm, but have failed.  

Any suggestions??????????

Thanks,