hughdagg@Hughs-iMac jpeg % cat config.log
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

configure:538: checking for gcc
configure:615: checking whether the C compiler (gcc  ) works
configure:629: gcc -o conftest    conftest.c  1>&5
configure:626:1: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
main(){return(0);}
^
int
1 error generated.
configure: failed program was:
#line 625 "configure"
#include "confdefs.h"
main(){return(0);}