* installing *source* package ‘RMySQL’ ...
** package ‘RMySQL’ successfully unpacked and MD5 sums checked
./configure: line 22: /usr/bin/mysql_config: Permission denied
./configure: line 23: /usr/bin/mysql_config: Permission denied
Using PKG_CFLAGS=
Using PKG_LIBS=-lmysqlclient
------------------------- ANTICONF ERROR ---------------------------
Configuration failed because no mysql client library was found. Try installing:
 * deb: libmariadbclient-dev | libmariadb-client-lgpl-dev (Debian, Ubuntu)
 * rpm: mariadb-connector-c-devel | mariadb-devel | mysql-devel (Fedora, CentOS, RHEL)
 * csw: mysql56_dev (Solaris)
 * brew: mariadb-connector-c (OSX)
If you already have a mysql client library installed, verify that either
mariadb_config or mysql_config is on your PATH. If these are unavailable
you can also set INCLUDE_DIR and LIB_DIR manually via:
R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'
--------------------------------------------------------------------
ERROR: configuration failed for package ‘RMySQL’
* removing ‘/usr/lib64/R/library/RMySQL’

The downloaded source packages are in
  ‘/tmp/Rtmp30En7N/downloaded_packages’
Updating HTML index of packages in '.Library'
Making 'packages.html' ... done
Warning message:
In install.packages("RMySQL") :
  installation of package ‘RMySQL’ had non-zero exit status