PLEASE HELP A gfortran NEWBIE...

I'm running a late 2011 13" MacBook Pro with a 2.7 GHz Intel Core i7 processor and OS-X 10.7.4

Today I downloaded XCode via the Mac App Store and successfully installed it with a default install and no error messages.

I also downloaded and successfully executed the gfortran apple installer (version 4.6.2) for OX Lion (10.7) - installer released 2011-10-20 from the GCC website.

I then went into my user directory via the Terminal, and found there was no ".bash_profile" file. So I created one with a single line (followed by a carriage return). The single line is:
"export PATH=/usr/local/binPATH"

I restarted my computer at this point.

I then created a simple fortran text file (named hiworld.f77 and saved as text), that reads:
PROGRAM HIWORLD
WRITE(UNIT=*, FMT=*) 'Hello World'
END

When I try to compile the code (from within the directory the hiworld.f77 source code is in) with the following statement from the Terminal,

gfortran hiworld.f77 -o hiworld

I receive the following error message from the Terminal:

"collect2: cannot find 'ld'

I get the same error message if I attempt to compile with the following command:

/usr/local/bin/gfortran hiworld.f77 -o hiworld

WHAT AM I DOING WRONG?

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Thanks for understanding!

Thanks

And thank you for the assistance. My first post on the forum, so I do appreciate it.

Further Developments

Based on some related posts here, I went back and installed the XCode Command Line tools via the Downloads tab on the XCode Preferences Window.

Now, when I type in gfortran hiworld.f77 -o hiworld,

I get the following...

ld: warning: ignoring file hiworld.f77, file was built for unsupported file format which is not the architecture being linked (x86_64)
Undefined symbols for architecture x86_64:
"_main", referenced from:
start in crt1.10.5.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status