Cannot install Bison

[Michael Welch]

Tried to install Bison, for whatever reason it wont install...see  
below.  Any help?

Macintosh:~ jswelch$ sudo port clean
Can't map the URL 'file://.' to a port description file ("Could not  
find Portfile in /Users/jswelch").
Please verify that the directory and portfile syntax are correct.
To use the current port, you must be in a port's directory.
(you might also see this message if a pseudo-port such as
outdated or installed expands to no ports).
Error: Unable to open port: Could not find Portfile in /Users/jswelch
Macintosh:~ jswelch$ sudo port install bison
--->  Configuring expat
Error: Target org.macports.configure returned: configure failure:  
shell command " cd "/opt/local/var/macports/build/ 
_opt_local_var_macports_sources_rsync 
.macports.org_release_ports_textproc_expat/work/expat-2.0.1" && ./ 
configure --prefix=/opt/local --mandir=/opt/local/share/man " returned  
error 77
Command output: checking build system type... i386-apple-darwin9.1.0
checking host system type... i386-apple-darwin9.1.0
checking for gcc... gcc
checking for C compiler default output file name... configure: error:  
C compiler cannot create executables
See `config.log' for more details.

Error: The following dependencies failed to build: gettext expat  
libiconv m4
Error: Status 1 encountered during processing.