Hi Bill,
That's funny, it's just the opposite for me.
I'm trying to build on RHEL3 Linux (gcc 4.2.2). After running autogen, I run make and it starts complaining about not finding xcode:
$ make
make[1]: Entering directory `/workplace2/build/WebKit/JavaScriptCore'
( xcodebuild -target All `perl -I../WebKitTools/Scripts -Mwebkitdirs -e 'print XcodeOptionString()'` | grep -v setenv && exit ${PIPESTATUS[0]} )
/bin/sh: line 1: xcodebuild: command not found
make[1]: *** [all] Error 1
make[1]: Leaving directory `/workplace2/build/WebKit/JavaScriptCore'
make: *** [all] Error 2