R 3.5.0安装data.table失败，RTools 3.5仍显示不兼容求助

Hey, I’ve dealt with this exact weird quirk before—you actually have the correct RTools version (R 3.5.x pairs with RTools 3.5), that error message is just a small bug in the find_rtools() function’s detection logic. Here are three proven fixes to get you up and running with data.table:

1. Manually Point R to Your RTools Installation #

Tell R exactly where your RTools lives by running these commands in your R console:

# Update PATH to include RTools bin directory
Sys.setenv(PATH = paste("C:/Rtools/bin", Sys.getenv("PATH"), sep = ";"))
# Set the binary prefix for mingw
Sys.setenv(BINPREF = "C:/Rtools/mingw_64/bin/")

Note: If you installed RTools to a different drive or folder (like D:\Rtools), adjust the paths to match your actual installation location. After running these, recheck with find_rtools(T)—the warning should disappear, and you can install data.table normally.

2. Add RTools to Your System’s PATH Environment Variable #

Sometimes R can’t find RTools because the system PATH doesn’t include its directories. Fix this manually:

• Right-click "This PC" → Properties → Advanced System Settings → Environment Variables
• Under "System Variables", find the PATH variable, click "Edit"
• Add two new entries: [Your RTools Folder]/bin and [Your RTools Folder]/mingw_64/bin (e.g., C:\Rtools\bin and C:\Rtools\mingw_64\bin)
• Restart R/RStudio, then run find_rtools(T) to verify

3. Bypass find_rtools() and Install data.table Directly #

The error from find_rtools() doesn’t always mean installation will fail. Try installing data.table from source directly:

install.packages("data.table", type = "source")

If your RTools paths are set up correctly under the hood, this command will use RTools to compile and install the package, ignoring the misleading warning.

Quick sanity check: You don’t need to download a different RTools version—R 3.5.0 does require RTools 3.5. The issue is purely about R detecting it properly, not a version mismatch.

内容的提问来源于stack exchange，提问作者Omry Atia