install.packages("RODBC“)，结果返回
configure: error: "ODBC headers sql.h and sqlext.h not found"
ERROR: configuration failed for package ‘RODBC’
* removing ‘/home/samael/R/x86_64-unknown-linux-gnu-library/3.0/RODBC’

The downloaded source packages are in
        ‘/tmp/Rtmpz50Lpj/downloaded_packages’
Warning message:
In install.packages("RODBC") :
  installation of package ‘RODBC’ had non-zero exit status

我已经装了iodbc和mysql了，求问原因