* installing *source* package ‘ExactTree’ ...
** this is package ‘ExactTree’ version ‘0.1.1’
** package ‘ExactTree’ successfully unpacked and MD5 sums checked
** using staged installation
** libs
using C compiler: ‘Apple clang version 14.0.3 (clang-1403.0.22.14.1)’
using Fortran compiler: ‘GNU Fortran (GCC) 14.2.0’
using SDK: ‘MacOSX11.3.1.sdk’
/opt/gfortran/bin/gfortran -arch x86_64  -fPIC  -Wall -g -O2  -c  OptTreeCallBacks.f95 -o OptTreeCallBacks.o
/opt/gfortran/bin/gfortran -arch x86_64  -fPIC  -Wall -g -O2  -c  Timer.f95 -o Timer.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG   -I/opt/R/x86_64/include    -fPIC  -falign-functions=64 -Wall -g -O2  -c init.c -o init.o
Timer.f95:7:5:

    7 | USE OptTreeCallBacks, ONLY: dp
      |     1
Fatal Error: Cannot open module file 'opttreecallbacks.mod' for reading at (1): No such file or directory
compilation terminated.
make: *** [Timer.o] Error 1
make: *** Waiting for unfinished jobs....
ERROR: compilation failed for package ‘ExactTree’
* removing ‘/Volumes/Builds/packages/big-sur-x86_64/results/4.6/ExactTree.Rcheck/ExactTree’