[R] hcc not found, rcmd build

[Patrick Giraudoux]

Working under Windows XP, I am compiling a package called 'pgirmess' 
with the command

rcmd build --binary --auto-zip pgirmess

I have this message error after having listed: functions text html latex 
example chm
....
zipping help file
hcc: not found
cp: cannot stat 'c:/TEMP/Rbuild365620874/pgirmess/chm/pgirmess.chm': No 
such file or directory
make[1]: *** [chm-pgirmess] Error 1
make: *** [pkg-pgirmess] Error 2
*** Installation of pgirmess failed ***

I have recently installed MikTex 2.5 and Perl (I have been obliged to 
format my hard disk and reinstall everything after a computer crash...).

Has anyone an idea about what means hcc: not found and how to make "hcc" 
available to the programme?

Thanks in advance for any hint,

Patrick