@yihui

I created a bookdown project works fine on windows 10, I built it several times successfully. when I clone it to macos, some unfortunate things happen.

> sessionInfo()
R version 4.0.0 (2020-04-24)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.5

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
 [1] compiler_4.0.0  bookdown_0.19   htmltools_0.4.0 tools_4.0.0     yaml_2.2.1     
 [6] Rcpp_1.0.4.6    rmarkdown_2.2   knitr_1.28      xfun_0.14       digest_0.6.25  
[11] rlang_0.4.6     evaluate_0.14  

The main content of .rmd file:

See Figure \@ref(fig:cars-plot).

```{r cars-plot, fig.cap="The cars data.", echo=FALSE}
par(mar = c(4, 4, .2, .1))
plot(cars) # a scatterplot
```

Pandoc and pandoc-citeproc were installed by brew. Build error info is as follow:

Error in split_chapters(output, gitbook_page, number_sections, split_by,  : 
  Automatically generated filenames contain duplicated ones: -
Calls: <Anonymous> ... <Anonymous> -> <Anonymous> -> split_chapters -> <Anonymous>
Execution halted

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