Found the following significant warnings:
  autocart.cpp:71:10: warning: using integer absolute value function 'abs' when argument is of floating point type [-Wabsolute-value]
  autocart.cpp:71:42: warning: using integer absolute value function 'abs' when argument is of floating point type [-Wabsolute-value]
See ‘/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/autocart.Rcheck/00install.out’ for details.
* used C++ compiler: ‘Debian clang version 18.1.7 (1)’
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Re-building vignettes had CPU time 3 times elapsed time
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Re-building vignettes had CPU time 2.6 times elapsed time
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Re-building vignettes had CPU time 3.6 times elapsed time
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Re-building vignettes had CPU time 3.5 times elapsed time
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.
Specified C++11: please drop specification unless essential
GNU make is a SystemRequirements.