title: Install Rtools and check if I can use it
body: <p>Dear R users with awesome brains.</p>
  
  <p>I newly installed R, Rstudio today.</p>
  
  <p>After I finished download Rtools.exe file from cran and unzip it, I've got this warning message when I tried to install the package in Rstudio</p>
  
  <pre><code>install.packages("Rtools")
  </code></pre>
  
  <blockquote>
    <p>Installing package into ‘C:/Users/Ellie/Documents/R/win-library/3.4’
    (as ‘lib’ is unspecified)
    Warning in install.packages :
      package ‘Rtools’ is not available (for R version 3.4.3)</p>
  </blockquote>
  
  <p>I cannot understand that "Rtools is not available for R version 3.4.3" because it worked on another computer a couple of days ago.</p>
  
  <p>It would be helpful if you give me a comment about this problem.</p>
  
  <p>Thanks!</p>
  
  <p>Ellie.</p>
  
  <hr>
  
  <p>I found the site that helps me to check if I can use Rtools in R.
  (Thanks for letting me know the Rtools is not a package)</p>
  
  <p><a href="https://github.com/stan-dev/rstan/wiki/Install-Rtools-for-Windows" rel="noreferrer">https://github.com/stan-dev/rstan/wiki/Install-Rtools-for-Windows</a></p>
  
  <p>And the result is:</p>
  
  <pre><code>Sys.getenv('PATH')
  </code></pre>
  
  <blockquote>
    <p>[1] "C:\Rtools\bin;C:\Program Files\R\R-3.4.3\bin\x64;C:\Program Files\R\R-3.4.3\library\Rtools\bin;C:\Program Files\R\R-3.4.3\library\Rtools\mingw_32\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Rtools\bin;C:\Users\Ellie\AppData\Local\Microsoft\WindowsApps;"</p>
  </blockquote>
  
  <pre><code>system('g++ -v')
  </code></pre>
  
  <blockquote>
    <p>Using built-in specs.
    COLLECT_GCC=C:\PROGRA~1\R\R-34~1.3\library\Rtools\mingw_32\bin\G__~1.EXE
    COLLECT_LTO_WRAPPER=C:/PROGRA~1/R/R-34~1.3/library/Rtools/mingw_32/bin/../libexec/gcc/i686-w64-mingw32/4.9.3/lto-wrapper.exe
    Target: i686-w64-mingw32
    Configured with: ../../../src/gcc-4.9.3/configure --host=i686-w64-mingw32 --build=i686-w64-mingw32 --target=i686-w64-mingw32 --prefix=/mingw32 --with-sysroot=/home/Jeroen/mingw-gcc-4.9.3/i686-493-posix-dwarf-rt_v3-s/mingw32 --with-gxx-include-dir=/mingw32/i686-w64-mingw32/include/c++ --enable-static --disable-shared --disable-multilib --enable-languages=c,c++,fortran,lto --enable-libstdcxx-time=yes --enable-threads=posix --enable-libgomp --enable-libatomic --enable-lto --enable-graphite --enable-checking=release --enable-fully-dynamic-string --enable-version-specific-runtime-libs --disable-sjlj-exceptions --with-dwarf2 --disable-isl-version-check --disable-cloog-version-check --disable-libstdcxx-pch --disable-libstdcxx-debug --enable-bootstrap --disable-rpath --disable-win32-registry --disable-nls --disable-werror --disable-symvers --with-gnu-as --with-gnu-ld --with-arch=i686 --with-tune=generic --with-libiconv --with-system-zlib --with-gmp=/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static --with-mpfr=/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static --with-mpc=/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static --with-isl=/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static --with-cloog=/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static --enable-cloog-backend=isl --with-pkgversion='i686-posix-dwarf, Built by MinGW-W64 project' --with-bugurl=<a href="http://sourceforge.net/projects/mingw-w64" rel="noreferrer">http://sourceforge.net/projects/mingw-w64</a> CFLAGS='-O2 -pipe -I/home/Jeroen/mingw-gcc-4.9.3/i686-493-posix-dwarf-rt_v3-s/mingw32/opt/include -I/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-zlib-static/include -I/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static/include' CXXFLAGS='-O2 -pipe -I/home/Jeroen/mingw-gcc-4.9.3/i686-493-posix-dwarf-rt_v3-s/mingw32/opt/include -I/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-zlib-static/include -I/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static/include' CPPFLAGS= LDFLAGS='-pipe -L/home/Jeroen/mingw-gcc-4.9.3/i686-493-posix-dwarf-rt_v3-s/mingw32/opt/lib -L/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-zlib-static/lib -L/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static/lib -Wl,--large-address-aware'
    Thread model: posix
    gcc version 4.9.3 (i686-posix-dwarf, Built by MinGW-W64 project)</p>
  </blockquote>
  
  <pre><code>system('where make')
  </code></pre>
  
  <blockquote>
    <p>C:\Rtools\bin\make.exe</p>
    
    <p>C:\ProgramFiles\R\R-3.4.3\library\Rtools\bin\make.exe</p>
  </blockquote>
  
  <p>Is the Rtool on my laptop available?</p>
  
  <p>Because I saw this part in the site I gave you above</p>
  
  <blockquote>
    <p>Sys.getenv('PATH')</p>
    
    <p>[1] "c:\\Rtools\\bin;c:\\Rtools\\<strong>gcc-4.6.3</strong>\\bin;...</p>
  </blockquote>
  
  <p>But mine does not. </p>
  
  <p>Thank you for answering my question in advance!</p>
  
  <p>Ellie.</p>