Found the following significant warnings:
  ./SSpace.h:578:10: warning: 'is_finite<arma::subview<double>>' is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  ./SSpace.h:713:13: warning: 'is_finite<arma::subview<double>>' is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  ./SSpace.h:849:12: warning: 'is_finite<arma::subview<double>>' is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  ./SSpace.h:1032:10: warning: 'is_finite<arma::subview<double>>' is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  ./SSpace.h:1128:11: warning: 'is_finite<arma::subview<double>>' is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  ./ETSmodel.h:1008:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1037:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1048:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1061:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1074:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1088:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1113:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1121:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1131:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1141:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1153:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1165:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1177:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1196:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  ./ETSmodel.h:1209:25: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
See ‘/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/UComp.Rcheck/00install.out’ for details.
* used C++ compiler: ‘Debian clang version 19.1.7 (7)’