I don't know what Rtools path should be
问题 What should I write on ${PATH}? First, I thought it was the directory where the script I was working on. Second I thought it was the directory where the make or something is. But both were wrong. 回答1: ${PATH} is the value of the path variable already present on your computer. PATH="${RTOOLS40_HOME}\usr\bin;${PATH}" is adding ${RTOOLS40_HOME}\usr\bin to the existing path so that RTOOLS can be found when needed. If RTOOLS installation went correctly, RTOOLS40_HOME environment variable should