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###
### Running command:
###
###   /Library/Frameworks/R.framework/Resources/bin/R CMD build --keep-empty-dirs --no-resave-data cfTools
###
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* checking for file ‘cfTools/DESCRIPTION’ ... OK
* preparing ‘cfTools’:
* checking DESCRIPTION meta-information ... OK
* cleaning src
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘cfTools-vignette.Rmd’ using rmarkdown
python-build: use openssl from homebrew
python-build: use readline from homebrew
Downloading Python-3.8.20.tar.xz...
-> https://www.python.org/ftp/python/3.8.20/Python-3.8.20.tar.xz
Installing Python-3.8.20...
python-build: use tcl-tk from homebrew
python-build: use readline from homebrew
python-build: use zlib from xcode sdk

BUILD FAILED (OS X 13.7.1 using python-build 2.6.3)

Inspect or clean up the working tree at /var/folders/r0/l4fjk6cj5xj0j3brt4bplpl40000gt/T/python-build.20250619160339.51498
Results logged to /var/folders/r0/l4fjk6cj5xj0j3brt4bplpl40000gt/T/python-build.20250619160339.51498.log

Last 10 log lines:
checking for a thread-safe mkdir -p... ./install-sh -c -d
checking for --with-pydebug... no
checking for --with-trace-refs... no
checking for --with-assertions... no
checking for --enable-optimizations... yes
checking PROFILE_TASK... -m test --pgo
checking for --with-lto... yes
checking for llvm-ar... no
configure: error: llvm-ar is required for a --with-lto build with clang but could not be found.
make: *** No targets specified and no makefile found.  Stop.

Quitting from cfTools-vignette.Rmd:164-167 [unnamed-chunk-3]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error:
! installation of Python 3.8 failed
---
Backtrace:
    ▆
 1. └─cfTools::MergePEReads(PEReads)
 2.   └─basilisk::basiliskStart(my_env)
 3.     └─basilisk::obtainEnvironmentPath(env)
 4.       └─basilisk::setupBasiliskEnv(...)
 5.         ├─base::suppressMessages(install_python(version))
 6.         │ └─base::withCallingHandlers(...)
 7.         └─reticulate::install_python(version)
 8.           └─reticulate:::stopf("installation of Python %s failed", version)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'cfTools-vignette.Rmd' failed with diagnostics:
installation of Python 3.8 failed
--- failed re-building ‘cfTools-vignette.Rmd’

SUMMARY: processing the following file failed:
  ‘cfTools-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted