* installing *source* package 'Rcplex' ...
** package 'Rcplex' successfully unpacked and MD5 sums checked
** using staged installation
** libs
make[1]: Entering directory '/d/temp/RtmpCKYepD/R.INSTALL2dcc4bc857e/Rcplex/src'
gcc  -I"D:/RCompile/recent/R/include" -DNDEBUG -D_LP64 -I"/include"    -I"d:/rtools42/x86_64-w64-mingw32.static.posix/include"     -pedantic -O2 -Wall  -std=gnu99 -mfpmath=sse -msse2 -mstackrealign  -c Rcplex.c -o Rcplex.o
In file included from Rcplex.c:2:
Rcplex.h:4:10: fatal error: ilcplex/cplex.h: No such file or directory
    4 | #include <ilcplex/cplex.h>
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.
make[1]: *** [D:/RCompile/recent/R/etc/x64/Makeconf:252: Rcplex.o] Error 1
make[1]: Leaving directory '/d/temp/RtmpCKYepD/R.INSTALL2dcc4bc857e/Rcplex/src'
ERROR: compilation failed for package 'Rcplex'
* removing 'd:/Rcompile/CRANpkg/lib/4.2/Rcplex'