this the output for the second command:
list.files(file.path(Sys.getenv(“RTOOLS40_HOME”), “mingw64”, “bin”))
[1] “addr2line.exe” “ar.exe” “as.exe”
[4] “autopoint” “bunzip2.exe” “bzcat.exe”
[7] “bzcmp” “bzdiff” “bzegrep”
[10] “bzfgrep” “bzgrep” “bzip2.exe”
[13] “bzip2recover.exe” “bzless” “bzmore”
[16] “c++.exe” “c++filt.exe” “cc.exe”
[19] “cpp.exe” “dlltool.exe” “dllwrap.exe”
[22] “dwp.exe” “elfedit.exe” “envsubst.exe”
[25] “g++.exe” “gcc-ar.exe” “gcc-nm.exe”
[28] “gcc-ranlib.exe” “gcc.exe” “gcov-tool.exe”
[31] “gcov.exe” “gendef.exe” “genidl.exe”
[34] “genlib.exe” “genpeimg.exe” “gettext.exe”
[37] “gettext.sh” “gettextize” “gfortran.exe”
[40] “gprof.exe” “ld.bfd.exe” “ld.exe”
[43] “ld.gold.exe” “mingw32-make.exe” “msgattrib.exe”
[46] “msgcat.exe” “msgcmp.exe” “msgcomm.exe”
[49] “msgconv.exe” “msgen.exe” “msgexec.exe”
[52] “msgfilter.exe” “msgfmt.exe” “msggrep.exe”
[55] “msginit.exe” “msgmerge.exe” “msgunfmt.exe”
[58] “msguniq.exe” “ngettext.exe” “nm.exe”
[61] “objcopy.exe” “objdump.exe” “pkg-config.exe”
[64] “ranlib.exe” “readelf.exe” “recode-sr-latin.exe”
[67] “size.exe” “strings.exe” “strip.exe”
[70] “widl.exe” “windmc.exe” “windres.exe”
[73] “x86_64-w64-mingw32-c++.exe” “x86_64-w64-mingw32-g++.exe” “x86_64-w64-mingw32-gcc-8.3.0.exe”
[76] “x86_64-w64-mingw32-gcc-ar.exe” “x86_64-w64-mingw32-gcc-nm.exe” “x86_64-w64-mingw32-gcc-ranlib.exe”
[79] “x86_64-w64-mingw32-gcc.exe” “x86_64-w64-mingw32-gfortran.exe” “x86_64-w64-mingw32-pkg-config.exe”
[82] “xgettext.exe”