Specified C++11: please drop specification unless essential
File ‘iptools/libs/iptools.so’:
  Found ‘sprintf’, possibly from ‘sprintf’ (C)
    Object: ‘asio_bindings.o’

Compiled code should not call entry points which might terminate R nor
write to stdout/stderr instead of to the console, nor use Fortran I/O
nor system RNGs nor [v]sprintf.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
Installation failed.
See ‘/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/iptools.Rcheck/00install.out’ for details.
Specified C++11: please drop specification unless essential
Note: found 12 marked UTF-8 strings
File ‘iptools/libs/iptools.so’:
  Found ‘sprintf’, possibly from ‘sprintf’ (C)
    Object: ‘asio_bindings.o’

Compiled code should not call entry points which might terminate R nor
write to stdout/stderr instead of to the console, nor use Fortran I/O
nor system RNGs nor [v]sprintf.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
Specified C++11: please drop specification unless essential
Note: found 12 marked UTF-8 strings
File ‘iptools/libs/iptools.so’:
  Found ‘__sprintf_chk’, possibly from ‘sprintf’ (C)
    Object: ‘asio_bindings.o’

Compiled code should not call entry points which might terminate R nor
write to stdout/stderr instead of to the console, nor use Fortran I/O
nor system RNGs nor [v]sprintf.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
Specified C++11: please drop specification unless essential
Note: found 12 marked UTF-8 strings
Note: found 12 marked UTF-8 strings
Note: found 12 marked UTF-8 strings
Note: found 12 marked UTF-8 strings