windows - Rtools not being detected by R

Question

Update:

I've written a brief walkthrough guide to installing Rtools on windows.

Original:

I am trying to build an R package using RStudio on Windows 7. When I attempt to build the package via RStudio's Build panel I receive:

WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

http://cran.rstudio.com/bin/windows/Rtools/

Loading library(devtools) and running find_rtools(T) gives:

Scanning path...
ls : F:Rtoolsinls.exe 
Scanning registry...
Found F:/Rtools for 3.1 
VERSION.txt
Rtools version 3.1.0.1936 
[1] TRUE

The Path variable is set as:

F:Rtoolsin;F:Rtoolsgcc-4.6.3in;F:Rtoolsperlin;F:RtoolsMinGWin;F:Program FilesRR-3.0.2inx64;F:Program Files (x86)HTML Help Workshop;F:Program FilesMiKTeX 2.9miktexinx64;C:Program Files (x86)NVIDIA CorporationPhysXCommon;C:Program FilesCommon FilesMicrosoft SharedWindows Live;C:Program Files (x86)Common FilesMicrosoft SharedWindows Live;C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32WindowsPowerShellv1.0;C:Program Files (x86)Windows LiveShared;C:Program FilesMicrosoft Network Monitor 3;F:Program Files (x86)QuickTimeQTSystem

I've also restarted several times, yet the error persists. I'm a bit confused as to why this is occurring.

Output when R access system variable Path:

> Sys.getenv()['PATH']
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 PATH 
"F:\Program Files\R\R-3.0.2\bin\x64;F:\Rtools\bin;F:\Rtools\gcc-4.6.3\bin;F:\Rtools\perl\bin;F:\Rtools\MinGW\bin;F:\Program Files\R\R-3.0.2\bin\x64;F:\Program Files (x86)\HTML Help Workshop;F:\Program Files\MiKTeX 2.9\miktex\bin\x64\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files\Microsoft Network Monitor 3\;F:\Program Files (x86)\QuickTime\QTSystem" 

The R version I am using is: R version 3.0.2 (2013-09-25) -- "Frisbee Sailing."

The Rstudio Version I am using is: 0.97.551. When I check for updates, I'm told that this is the latest patch.

> Sys.which("ls.exe")
                   ls.exe 
"F:\Rtools\bin\ls.exe" 
> Sys.which("gcc.exe")
gcc.exe 
     "" 

Answer 1

Turns out when I installed RTools I left out the R 2.15.x+ toolchain option in the installation, which lead to the gcc never being installed. Hopefully, this post will serve as a diagnostic guide if RStudio fails to register RTools.

Thank you everyone for your help.