Rtools not found

[dalonsoa]

When running devtools::check(), things start well, but then there's an error about Rtools:

══ Building ══════════════════════════════════════════════════════════════════
Setting env vars:
• CFLAGS    : -Wall -pedantic
• CXXFLAGS  : -Wall -pedantic
• CXX11FLAGS: -Wall -pedantic
• CXX14FLAGS: -Wall -pedantic
• CXX17FLAGS: -Wall -pedantic
• CXX20FLAGS: -Wall -pedantic
── R CMD build ───────────────────────────────────────────────────────────────
✔  checking for file 'C:\Users\dalonsoa\Projects\csvyr/DESCRIPTION' (960ms)
─  preparing 'csvyr': (933ms)
✔  checking DESCRIPTION meta-information
─  checking for LF line-endings in source and make files and shell scripts
─  checking for empty or unneeded directories
   Omitted 'LazyData' from DESCRIPTION
─  building 'csvyr_0.1.0.tar.gz'
   
══ Checking ══════════════════════════════════════════════════════════════════
Setting env vars:
• _R_CHECK_CRAN_INCOMING_REMOTE_               : FALSE
• _R_CHECK_CRAN_INCOMING_                      : FALSE
• _R_CHECK_FORCE_SUGGESTS_                     : FALSE
• _R_CHECK_PACKAGES_USED_IGNORE_UNUSED_IMPORTS_: FALSE
• NOT_CRAN                                     : true
trying URL 'https://cran.rstudio.com/bin/windows/Rtools/rtools44/files/rtools44-6104-6039.exe'
Content type 'application/x-msdownload' length 449027200 bytes (428.2 MB)
downloaded 428.2 MB

Error: Could not find tools necessary to compile a package
Call `pkgbuild::check_build_tools(debug = TRUE)` to diagnose the problem.

Then, after a while, it automatically launches the installation of Rtools after asking for user's approval. Installation takes a while but seems to conclude without any issues. Then, I re-run devtools::check() that ends up with the License note, as expected:

── R CMD check results ────────────────────────────────────── csvyr 0.1.0 ────
Duration: 19.4s

❯ checking DESCRIPTION meta-information ... NOTE
  Non-standard licence specification:
    What license is it under?
  Standardisable: FALSE

0 errors ✔ | 0 warnings ✔ | 1 note ✖

I had a fresh installation of R, so probably this is not really an issue for someone who has used R already, but it might be worrying for newbies. I'd suggest an explanation that something like this might happen.

[SaranjeetKaur]

Oh yes - good spot! This is required when working on a package for the first time. I guess I didn't come across it because I had it installed previously.

Will add the instructions for the same.