[R] Where does ' Setting LC_CTYPE failed, using "C" ' come from?

[Christian]

Hi,

I am fighting to get rid of the messages like:

During startup - Warning messages:
Setting LC_CTYPE failed, using "C"
Setting LC_COLLATE failed, using "C"

This is annoying, because when building a package using R CMD, This 
message keeps cropping up.

Here my R:
Sys.getlocale()
[1] "C"

Sys.getenv()
Apple_PubSub_Socket_Render
                         /private/tmp/com.apple.launchd.QGvw3T6OWU/Render
COLUMNS                 86
COMMAND_MODE            unix2003
DISPLAY                 :0
DYLD_FALLBACK_LIBRARY_PATH
 
/Library/Frameworks/R.framework/Resources/lib:/Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home/lib/server
EDITOR                  vi
HOME                    /Users/hoffmannc
INSIDE_EMACS            25.1.1,comint
LANG                    en_CH.UTF-8
LANGUAGE                en
LN_S                    ln -s
LOGNAME                 hoffmannc
MAKE                    make
PAGER                   cat
PATH 
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin:/opt/X11/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/texbin:/Library/TeX/texbin:/usr/local/texlive/2016/bin
PWD                     /Users/hoffmannc/Rtest
R_ARCH
R_BROWSER               /usr/bin/open
R_BZIPCMD               /usr/bin/bzip2
R_DOC_DIR               /Library/Frameworks/R.framework/Resources/doc
R_GZIPCMD               /usr/bin/gzip
R_HOME                  /Library/Frameworks/R.framework/Resources
R_INCLUDE_DIR           /Library/Frameworks/R.framework/Resources/include
R_LIBS_SITE
R_LIBS_USER             ~/Library/R/3.5/library
R_PAPERSIZE             a4
R_PDFVIEWER             /usr/bin/open
R_PLATFORM              x86_64-apple-darwin15.6.0
R_PRINTCMD              lpr
R_QPDF                  /Library/Frameworks/R.framework/Resources/bin/qpdf
R_RD4PDF                times,inconsolata,hyper
R_SESSION_TMPDIR 
/var/folders/rm/pd12qdtn55qc3vc0vg5v0_y40000gn/T//RtmpyBHBm8
R_SHARE_DIR             /Library/Frameworks/R.framework/Resources/share
R_SYSTEM_ABI            osx,gcc,gxx,gfortran,?
R_TEXI2DVICMD           /usr/local/bin/texi2dvi
R_UNZIPCMD              /usr/bin/unzip
R_ZIPCMD                /usr/bin/zip
SECURITYSESSIONID       186a9
SED                     /usr/bin/sed
SHELL                   /bin/bash
SHLVL                   1
SSH_AUTH_SOCK           /private/tmp/com.apple.launchd.z3z87lwMDc/Listeners
STATATERM               emacs
TAR                     /usr/bin/tar
TERM                    dumb
TERMCAP
TMPDIR                  /var/folders/rm/pd12qdtn55qc3vc0vg5v0_y40000gn/T/
USER                    hoffmannc
XPC_FLAGS               0x0
XPC_SERVICE_NAME        0
__CF_USER_TEXT_ENCODING
                         0x1F5:0:0

Pointers are welcome
C.

-- 
Christian Hoffmann
Rigiblickstrasse 15b
CH-8915 Hausen am Albis
Switzerland
Telefon +41-(0)44-7640853