Rcpp Rtools installed but error message g++ not found

install rtools
warning: rtools is required to build r packages but is not currently installed
package rtools is not available (for r version 3.6 2)
uninstall rtools
rstudio warning in system(cmd) : 'make' not found
rstudio not seeing rtools
rcpp in system cmd make not found

I have consulted existing entries on SO related to my specific issue, but still could not resolve it.

I am trying to do this with my machine at work, where I have limited admin rights, but I can run Rtools.exe, so I installed it.

My setup for R is:

 platform       x86_64-w64-mingw32          
 arch           x86_64                      
 os             mingw32                     
 system         x86_64, mingw32             
 version.string R version 3.3.0 (2016-05-03)

I am RStudion Version 0.99.902. I installed Rtools version

All of R, Rstudio, and Rtools are installed in C:/WORK/, which is where I have some limited admin rights.

In my system ENV variable, I have set up:

 C:\\WORK\\Rtools\\bin; C:\\WORK\\Rtools\\gcc-  4.6.3\\bin; C:\\WORK\\R-3.3.0\\bin\\x64;" 

When I run

 system('where make')

I get


When I run

 system('g++ -v')

I get:

 Using built-in specs.
 COLLECT_LTO_WRAPPER=c:/WORK/rtools/gcc-46~1.3/bin/../libexec/gcc/i686-w64-   mingw32/4.6.3/lto-wrapper.exe
 Target: i686-w64-mingw32
 Configured with: /data/gannet/ripley/Sources/mingw-test3/src/gcc/configure --host=i686-w64-mingw32 --build=x86_64-linux-gnu --target=i686-w64-mingw32 --with-sysroot=/data/gannet/ripley/Sources/mingw-test3/mingw32mingw32/mingw32 --prefix=/data/gannet/ripley/Sources/mingw-test3/mingw32mingw32/mingw32 --with-gmp=/data/gannet/ripley/Sources/mingw-test3/mingw32mingw32/prereq_install --with-mpfr=/data/gannet/ripley/Sources/mingw-test3/mingw32mingw32/prereq_install --with-mpc=/data/gannet/ripley/Sources/mingw-test3/mingw32mingw32/prereq_install --disable-shared --enable-static --enable-targets=all --enable-languages=c,c++,fortran --enable-libgomp --enable-sjlj-exceptions --enable-fully-dynamic-string --disable-nls --disable-werror --enable-checking=release --disable-win32-registry --disable-rpath --disable-werror CFLAGS='-O2 -mtune=core2 -fomit-frame-pointer' LDFLAGS=
 Thread model: win32
 gcc version 4.6.3 20111208 (prerelease) (GCC) 

When I compile, I get this error:

 Error in compileCode(f, code, language = language, verbose = verbose) : 
 Compilation ERROR, function(s)/method(s) not created!
 c:/Rtools/mingw_64/bin/g++: not found

My question is: why is R still looking for g++ in


Didn't I already set R to look for it in


Even when I manually added


in the ENV variable, I still got the same error. (I cannot make Rtools folder in C:/ due to admin rights.)

Has anyone run into this specific issue?

The path c:/Rtools/mingw_64/bin/ is hard-coded into the file Makeconflocated somewhere in the R installation (in my case C:\Progs\R\R-3.4.1\etc\x64), as the value of the variable BINPREF.

The easiest thing to do is to change this path to your path C:/WORK/Rtools/bin (in my case was C:/Progs/RTools/3.4/mingw_64/bin/). That worked for me in a fresh installation of R-3.4.1 and Rtools3.4, and a minimal example.

RStudio do not find Rtools and offer to install even if already , I try to look into Rstudio code source but not easy for me yet. an error if we use the rtools installer from Rstudio that install the rtools binary in c:/Rbuildtools . Rcpp 1.0.0 2018-11-07 [1] CRAN (R 3.5.1) remotes 2.0.2 2018-10-30 [1] -o RcppExports.o C:/Rtools/mingw_64/bin/g++ -shared -s -static-libgcc  Teams. Q&A for Work. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

What is happening is the need to be on RTools 34 and NOT 33 for R 3.3.x.

Remove the rtools install and then follow the guide here:


@David, you need to remove all instances of C:\WORK\Rtools\<something> and any duplicates (e.g. C:\WORK\R-3.3.0\bin\x64 appears twice.) Then add:

c:\WORK\Rtools\bin; c:\WORK\Rtools\mingw_32\bin;

Rcpp looking for Rtools in wrong place · Issue #545 · RcppCore , kendonB opened this issue on Aug 27, 2016 · 6 comments -c tmp.cpp -o tmp.o C:/Rtools-3.3/mingw_64/bin/g++: not found make: *** [tmp.o] Error 127 Warning message: It's looking in C:/Rtools-3.3 but Rtools gets installed in C:/Rtools. Note that there are new potential kinds of problems (from R 3.3 onwards), since R (not RStudio, but R) adds a BINPREF variable and modifies the Path variable by default, see the Renviron.site file for the latter, on Windows typically e.g. under C:\Program Files\R\R-3.4.3\etc:

A plausible and easy way to do this is to choose "Full installation to build 32 or 64 bit" in the following promp.

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How to Fix Compilation Failure on Windows · Parallel Analog , If you've got the following error on Windows when installing the RAnEn package: -DNDEBUG -I"C:/Users/student/Documents/R/R-3.2.2/library/Rcpp/include" -​O2 -Wall -mtune=core2 -c AnEn.cpp -o AnEn.o sh: g++: command not found First, whether you have installed the correct version of Rtools that  Unfortunately, it does not work on Windows: devtools::install_github ("r-lib/pkgbuild") fails because the CRAN version of devtools does not accept either R 3.5 nor Rtools 3.5 to compile it. We need a binary of pkgbuild on CRAN first to allow using Rtools. I went back to R 3.4.4 and Rtools 3.4 until pkgbuild is on CRAN.

Using Rtools40 on Windows, Starting with R 4.0.0 (released April 2020), R for Windows uses a brand new the precompiled “binary packages” from CRAN, for which you do not need rtools! that make can be found, which should show the path to your Rtools installation. Hello, I got the following message while trying to install DADA2 on R3.3.1 (Windows7) using the devtools method: The downloaded binary packages are in C:\Users\torti\AppData\Local\Temp\RtmpkX86oo\d

  • Sys.getenv()['PATH'] gives C:\WORK\R-3.3.0\bin\x64; C:\WORK\Rtools\bin; C:\WORK\Rtools\mingw_64\bin; C:\WORK\Rtools\bin; C:\WORK\Rtools\mingw_32\bin; C:\WORK\R-3.3.0\bin\x64; C:\WINDOWS\system32; C:\WINDOWS; C:\WINDOWS\System32\Wbem; C:\Program Files (x86)\Microsoft Office\Office14; C:\WINDOWS\System32\WindowsPowerShell\v1.0\; Sys.getenv()['PATH'] C:\APPS\Global\dev_tools;C:\Program Files (x86)\Enterprise Vault\EVClient\; C:\WORK\TortoiseSVN\bin; C:\WORK\Rtools\bin; C:\WORK\Rtools\mingw_64\bin; C:\WORK\R-3.3.0\bin\x64
  • Modifying Makeconf file should be included as a step in updating Rtools
  • Especially since it is installed in RBuildTools directory by default. Thank you!
  • The page at cran.r-project.org/bin/windows/Rtools mentions Rtools3.3 to R 3.2.* and R 3.3.*, and Rtools3.4 for R 3.3.* and up, implying a choice. So OP may just have a PATH issue?
  • I uninstalled Rtools33 and installed Rtools34. I still got the same error message: "Compilation ERROR, function(s)/method(s) not created! c:/Rtools/mingw_64/bin/g++: not found". I still can't get R to look for "Rtools/mingw_64/bin" in the place I installed even though I added the path in the ENV variable's PATH.
  • Please add the output from the following to your post above: Sys.getenv()['PATH']
  • @DirkEddelbuettel , I've had better luck on Windows builds associating R with the latest RTools. You are correct in this case that it is definitely a path issue.
  • The newest version of Rtools actually constructs paths to the gcc / g++ compilers on demand; you now only need Rtools\bin on the PATH. When make.exe is called, R will then effectively tell it to look for gcc at ..\mingw_64\bin\gcc.exe (assuming 64bit Windows). Note that the directories Rtools\mingw_32 and Rtools\mingw_64 should be populated by default by the new Rtools installers.