[NTG-context] Context doesn't work

I've installed Context and attempted $ texexec fig3_2.tex The response is: the file 'texexec.rb' is not found setuptex was run and TEXROOT is correctly set. texexec is: #!/bin/sh texmfstart texexec.rb "$@" There seems to be nothing there which would enable the script to be located. Does texexec have to be changed to state the full path to the script? Does that have to be done with anything else?