Check: compiled code, Result: WARNING File ‘colorout/libs/colorout.so’: Found ‘___stderrp’, possibly from ‘stderr’ (C) Object: ‘colorout.o’ Found ‘___stdoutp’, possibly from ‘stdout’ (C) Object: ‘colorout.o’ Found ‘_printf’, possibly from ‘printf’ (C) Object: ‘colorout.o’ Found ‘_sprintf’, possibly from ‘sprintf’ (C) Object: ‘colorout.o’ File ‘colorout/libs/colorout.so’: Found non-API calls to R: ‘R_Consolefile’, ‘R_Outputfile’, ‘ptr_R_WriteConsole’, ‘ptr_R_WriteConsoleEx’ 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. Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.