[R] Problems installing docopt

[Neale Ferguson]

Hi,
 I¹ve seen similar questions when googling this problem but none of them
seem directly related to what I am seeing. Doing an install.r docopt craps
out with stringi build complaining:

Error in iconv(x, "latin1", "ASCII") :
   unsupported conversion from 'latin1' to 'ASCII'


Searching came up with issues relating to using the C locale and the need
to use en_US.UTF-8. However, my locale is already set up as such:

# locale
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=en_US.UTF-8


I¹m at a loss as to what look at next. (This is on a CentOS 7.1 system/)

Neale