Here is the contents of the files output in the conf directory. Not much help:
SERVERx:IO-Tty-1.10$ cat conf/compilerok.c
int main () { return 0; }
SERVERx:IO-Tty-1.10$ cat conf/compilerok.log
cc1: unrecognized option `-Wdeclaration-after-statement'
cc1: warning: changing search order for system directory "/usr/local/include"
cc1: warning: as it has already been specified as a non-system directory