Windows环境下修改CRAN下载的R包源码后如何重新安装？

Got it, let’s walk through this step-by-step—this is a common workflow when you spot a bug in an R package and need to patch it yourself on Windows.

Step 1: Download the Source Package #

First, grab the source version of the package from CRAN. You have two options:

• Go to the package’s CRAN page, scroll down to the "Sources" section, and download the .tar.gz file.
• Or do it directly from R with this command:

  download.packages("your_package_name", destdir = ".", type = "source")
  

  This saves the .tar.gz file in your current working directory.

Step 2: Extract the Source Files #

Next, unpack the .tar.gz archive:

• GUI way: Right-click the file and use your favorite unzip tool (like 7-Zip or Windows’ built-in extractor) to extract it to a folder (e.g., ./modified_your_package).
• R command way: Run this to extract programmatically:

  untar("your_package_name.tar.gz", exdir = "./modified_your_package")
  

Step 3: Fix the Problem Script #

Navigate to the extracted folder. The R scripts you need to modify are almost always in the R/ subdirectory. Open the problematic .R file with RStudio (or any text editor you prefer), make your fixes, and save the file.

Pro tip: If the bug was in compiled code (like C/C++ files in the src/ folder), you’d edit those too—but since you mentioned a "script," the R/ folder is your focus.

Step 4: Set Up the Windows Compilation Environment #

Windows doesn’t come with a compiler by default, so you’ll need Rtools to build the package from source. Here’s how to get it sorted:

1. Download the version of Rtools that matches your R version from the CRAN Rtools page (e.g., Rtools42 for R 4.2.x and newer).
2. During installation, make sure to check the box that says "Add Rtools to system PATH" (this saves you from manual path setup later).
3. Verify it’s working by running these commands in R:

   Sys.which("make")  # Should return a path to make.exe in Rtools
   devtools::has_devel()  # Should return TRUE if everything is set up
   

   If has_devel() fails, double-check your Rtools installation and PATH settings.

Step 5: Reinstall the Modified Package #

Now you’re ready to build and install your patched package. Pick one of these methods:

Method 1: Use devtools (easiest for most) #

If you don’t have devtools installed, install it first: install.packages("devtools"). Then run:

devtools::install("./modified_your_package")

This handles dependencies, builds the package, and installs it.

Method 2: Base R Command #

You can also use the base R install.packages() function by pointing it to your modified source folder:

install.packages("./modified_your_package", repos = NULL, type = "source")

Method 3: RStudio Build Interface #

If you open the extracted folder as an RStudio project (go to File > Open Project and select the .Rproj file in the source folder), use the Build pane:

• Click Build > Install and Restart to build the package and restart R with the new version loaded.

Step 6: Verify the Fix #

Once installation finishes, load the package with library(your_package_name) and test the functionality that had the bug. If everything works as expected, you’re good to go!

Quick note: If you update R or the original package from CRAN later, your patched version will be overwritten—so keep a copy of your modified source folder if you need to reapply the fix down the line.

内容的提问来源于stack exchange，提问作者dsbisht