> install.packages("RODBC")
Package which is only available in source form, and may need
  compilation of C/C++/Fortran: ‘RODBC’
Do you want to attempt to install these from sources?
y/n: y
installing the source package ‘RODBC’

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0 66 1130k   66  751k    0     0   871k      0  0:00:01 --:--:--  0:00:01  871k100 1130k  100 1130k    0     0  1223k      0 --:--:-- --:--:-- --:--:-- 1223k
* installing *source* package ‘RODBC’ ...
** 成功将‘RODBC’程序包解包并MD5和检查
checking for gcc... clang
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether clang accepts -g... yes
checking for clang option to accept ANSI C... none needed
checking how to run the C preprocessor... clang -E
checking for egrep... grep -E
checking for ANSI C header files...
rm: conftest.dSYM: is a directory
rm: conftest.dSYM: is a directory
yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking sql.h usability... no
checking sql.h presence... no
checking for sql.h... no
checking sqlext.h usability... no
checking sqlext.h presence... no
checking for sqlext.h... no
configure: error: "ODBC headers sql.h and sqlext.h not found"
ERROR: configuration failed for package ‘RODBC’
* removing ‘/Library/Frameworks/R.framework/Versions/3.2/Resources/library/RODBC’
Warning in install.packages :
  installation of package ‘RODBC’ had non-zero exit status

The downloaded source packages are in
        ‘/private/var/folders/qh/9v7h2nfs59l7yfr6j75m2v180000gs/T/RtmpcixViW/downloaded_packages’