[R] mpfr function in Rmpfr crashes R

[Roger Bos]

All,

The following code crashes by R on my mac with a message "R session
aborted.  A fatal error occured".

```
library(Rmpfr)
Rmpfr::mpfr(pi, 120)
```

Does anyone have any suggestions?   My session info is below:

R version 4.0.3 (2020-10-10)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Big Sur 10.16

Matrix products: default
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] datasets  utils     stats     graphics  grDevices methods   base

other attached packages:
 [1] alphavantager_0.1.2 googlesheets4_0.2.0 googledrive_1.0.1
clipr_0.7.1
 [5] jsonlite_1.7.2      stringi_1.5.3       dtplyr_1.0.1
 data.table_1.13.6
 [9] dplyr_1.0.4         plyr_1.8.6          testthat_3.0.1
 lubridate_1.7.9.2
[13] timeDate_3043.102   sendmailR_1.2-1     rmarkdown_2.6
devtools_2.3.2
[17] usethis_2.0.0       xts_0.12.1          zoo_1.8-8
MASS_7.3-53
[21] fortunes_1.5-4

loaded via a namespace (and not attached):
 [1] tinytex_0.29      tidyselect_1.1.0  xfun_0.20         remotes_2.2.0
  purrr_0.3.4
 [6] gargle_0.5.0      lattice_0.20-41   generics_0.1.0    vctrs_0.3.6
  htmltools_0.5.1.1
[11] base64enc_0.1-3   rlang_0.4.10      pkgbuild_1.2.0    pillar_1.4.7
 glue_1.4.2
[16] withr_2.4.1       DBI_1.1.1         sessioninfo_1.1.1 lifecycle_0.2.0
  cellranger_1.1.0
[21] evaluate_0.14     memoise_2.0.0     knitr_1.31        callr_3.5.1
  fastmap_1.1.0
[26] ps_1.5.0          curl_4.3          Rcpp_1.0.6        openssl_1.4.3
  cachem_1.0.1
[31] desc_1.2.0        pkgload_1.1.0     fs_1.5.0          askpass_1.1
  digest_0.6.27
[36] processx_3.4.5    grid_4.0.3        rprojroot_2.0.2   cli_2.3.0
  tools_4.0.3
[41] magrittr_2.0.1    tibble_3.0.6      crayon_1.4.0      pkgconfig_2.0.3
  ellipsis_0.3.1
[46] prettyunits_1.1.1 httr_1.4.2        assertthat_0.2.1  R6_2.5.0
 compiler_4.0.3
19:05:52  >

Thanks,

Roger

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