• using R version 4.6.0 (2026-04-24)
• using platform: x86_64-pc-linux-gnu
• R was compiled by     gcc-16 (Debian 16.1.0-1) 16.1.0     GNU Fortran (Debian 16.1.0-1) 16.1.0
• running under: Debian GNU/Linux forky/sid
• using session charset: UTF-8 * current time: 2026-06-13 09:12:37 UTC
• checking for file ‘brms/DESCRIPTION’ ... OK
• checking extension type ... Package
• this is package ‘brms’ version ‘2.23.0’
• package encoding: UTF-8
• checking package namespace information ... OK
• checking package dependencies ... INFO Package suggested but not available for checking: ‘cmdstanr’
• checking if this is a source package ... OK
• checking if there is a namespace ... OK
• checking for executable files ... OK
• checking for hidden files and directories ... OK
• checking for portable file names ... OK
• checking for sufficient/correct file permissions ... OK
• checking whether package ‘brms’ can be installed ... OK See the install log for details.
• checking package directory ... OK
• checking for future file timestamps ... OK
• checking ‘build’ directory ... OK
• checking DESCRIPTION meta-information ... OK
• checking top-level files ... OK
• checking for left-over files ... OK
• checking index information ... OK
• checking package subdirectories ... OK
• checking code files for non-ASCII characters ... OK
• checking R files for syntax errors ... OK
• checking whether the package can be loaded ... [5s/6s] OK
• checking whether the package can be loaded with stated dependencies ... [5s/5s] OK
• checking whether the package can be unloaded cleanly ... [5s/6s] OK
• checking whether the namespace can be loaded with stated dependencies ... [4s/5s] OK
• checking whether the namespace can be unloaded cleanly ... [5s/6s] OK
• checking loading without being on the library search path ... [5s/5s] OK
• checking whether startup messages can be suppressed ... [5s/7s] OK
• checking use of S3 registration ... OK
• checking dependencies in R code ... OK
• checking S3 generic/method consistency ... OK
• checking replacement functions ... OK
• checking foreign function calls ... OK
• checking R code for possible problems ... [122s/155s] OK
• checking Rd files ... [2s/2s] OK
• checking Rd metadata ... OK
• checking Rd line widths ... OK
• checking Rd cross-references ... OK
• checking for missing documentation entries ... OK
• checking for code/documentation mismatches ... OK
• checking Rd \usage sections ... OK
• checking Rd contents ... OK
• checking for unstated dependencies in examples ... OK
• checking contents of ‘data’ directory ... OK
• checking data for non-ASCII characters ... [0s/1s] OK
• checking LazyData ... OK
• checking data for ASCII and uncompressed saves ... OK
• checking R/sysdata.rda ... OK
• checking sizes of PDF files under ‘inst/doc’ ... OK
• checking installed files from ‘inst/doc’ ... OK
• checking files in ‘vignettes’ ... OK
• checking examples ... [10s/14s] OK
• checking for unstated dependencies in ‘tests’ ... OK
• checking tests ... [146s/183s] OK   Running ‘testthat.R’ [146s/183s]
• checking for unstated dependencies in vignettes ... OK
• checking package vignettes ... OK
• checking re-building of vignette outputs ... [71s/98s] WARNING Error(s) in re-building vignettes:   ... --- re-building ‘brms_customfamilies.Rmd’ using rmarkdown Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH --- finished re-building ‘brms_customfamilies.Rmd’ --- re-building ‘brms_distreg.Rmd’ using rmarkdown Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH --- finished re-building ‘brms_distreg.Rmd’ --- re-building ‘brms_families.Rmd’ using rmarkdown --- finished re-building ‘brms_families.Rmd’ --- re-building ‘brms_missings.Rmd’ using rmarkdown Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH --- finished re-building ‘brms_missings.Rmd’ --- re-building ‘brms_monotonic.Rmd’ using rmarkdown Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH --- finished re-building ‘brms_monotonic.Rmd’ --- re-building ‘brms_multivariate.Rmd’ using rmarkdown Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH --- finished re-building ‘brms_multivariate.Rmd’ --- re-building ‘brms_nonlinear.Rmd’ using rmarkdown Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH --- finished re-building ‘brms_nonlinear.Rmd’ --- re-building ‘brms_phylogenetics.Rmd’ using rmarkdown Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH --- finished re-building ‘brms_phylogenetics.Rmd’ --- re-building ‘brms_threading.Rmd’ using rmarkdown Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH Warning in hook_png(..., cmd = "pngquant", post_process = function(x) { :   cannot find pngquant; please install and put it in PATH --- finished re-building ‘brms_threading.Rmd’ --- re-building ‘brms_multilevel.ltx’ using tex Error: processing vignette 'brms_multilevel.ltx' failed with diagnostics: Running 'texi2dvi' on 'brms_multilevel.ltx' failed. LaTeX errors: ! Undefined control sequence. <argument> cite.\@citeb                         \@extra@b@citeb l.55 \begin{document}                       ! Emergency stop. <argument> cite.\@citeb                         \@extra@b@citeb l.55 \begin{document}                       ! ==> Fatal error occurred, no output PDF file produced! --- failed re-building ‘brms_multilevel.ltx’ --- re-building ‘brms_overview.ltx’ using tex Error: processing vignette 'brms_overview.ltx' failed with diagnostics: Running 'texi2dvi' on 'brms_overview.ltx' failed. LaTeX errors: ! Undefined control sequence. <argument> cite.\@citeb                         \@extra@b@citeb l.54 \begin{document}                       ! Emergency stop. <argument> cite.\@citeb                         \@extra@b@citeb l.54 \begin{document}                       ! ==> Fatal error occurred, no output PDF file produced! --- failed re-building ‘brms_overview.ltx’ SUMMARY: processing the following files failed:   ‘brms_multilevel.ltx’ ‘brms_overview.ltx’ Error: Vignette re-building failed. Execution halted
• checking PDF version of manual ... [15s/20s] OK
• checking HTML version of manual ... [22s/33s] OK
• checking for non-standard things in the check directory ... OK
• DONE

Status: 1 WARNING