>> \definetypeface[charter] [rm][serif][charter]
>> [default][encoding=texnansi] \definetypeface[utopia] [rm][serif][utopia]
>> [default][encoding=texnansi] \definetypeface[bookman]
>> [rm][serif][bookman] [default][encoding=texnansi]
>> \definetypeface[palatino][rm][serif][palatino][default][encoding=texnansi
>> ]
>>
>> \starttext
>> \switchtobodyfont[ 10pt] \input tufte \par
>> \switchtobodyfont[charter, 10pt] \input tufte \par
>> \switchtobodyfont[utopia, 10pt] \input tufte \par
>> \switchtobodyfont[bookman, 10pt] \input tufte \par
>> \switchtobodyfont[palatino,10pt] \input tufte \par
>> \stoptext
>>
>
> this gives me
>
> [...]
> kpathsea: Running mktextfm texnansi-bchr8a
>
> which cannot be found.
>
If you comment out the lines for charter does the rest of it work. Mine
does.