shiny app deployment failed because libgit2 is not installed on shinyapps.io for package gert

Hi there,

I cannot deploy my app to shinyapps.io anymore because one library dependecy "gert" cannot be installed on the server. I posted an issue here.

The error is

[2020-12-17T08:57:23.608444729+0000] Building R package: gert (1.0.2)
/mnt/packages/build /mnt
* installing to library ‘/opt/R/4.0.3/lib/R/library’
* installing *source* package ‘gert’ ...
** package ‘gert’ successfully unpacked and MD5 sums checked
** using staged installation
Using PKG_CFLAGS=
Using PKG_LIBS=-lgit2
----------------------------- ANTICONF -------------------------------
Configuration failed to find libgit2 library. Try installing:
 * brew: libgit2 (MacOS)
 * deb: libgit2-dev (Debian, Ubuntu, etc)
 * rpm: libgit2-devel (Fedora, CentOS, RHEL)
If libgit2 is already installed, check that 'pkg-config' is in your
PATH and PKG_CONFIG_PATH contains a libgit2.pc file. If pkg-config
is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:
R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'
-------------------------- [ERROR MESSAGE] ---------------------------
<stdin>:1:18: fatal error: git2.h: No such file or directory
compilation terminated.
----------------------------------------------------------------------
ERROR: configuration failed for package ‘gert’
* removing ‘/opt/R/4.0.3/lib/R/library/gert’

My session info is

> sessionInfo()
R version 4.0.3 (2020-10-10)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18363)

Matrix products: default

Random number generation:
 RNG:     Mersenne-Twister 
 Normal:  Inversion 
 Sample:  Rounding 
 
locale:
[1] LC_COLLATE=English_New Zealand.1252  LC_CTYPE=English_New Zealand.1252    LC_MONETARY=English_New Zealand.1252
[4] LC_NUMERIC=C                         LC_TIME=English_New Zealand.1252    

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

other attached packages:
 [1] shinyWidgets_0.5.4    shinycssloaders_1.0.0 shinyjs_2.0.0         shinydashboard_0.7.1  DT_0.16               shiny_1.5.0          
 [7] ggdendro_0.1.22       webr_0.1.5            moonBook_0.2.3        ggplot2_3.3.2         tidyr_1.1.2           dplyr_1.0.2          
[13] gert_1.0.2           

loaded via a namespace (and not attached):
  [1] nlme_3.1-149       RColorBrewer_1.1-2 insight_0.11.1     tools_4.0.3        backports_1.2.1    R6_2.5.0           sjlabelled_1.1.7  
  [8] colorspace_2.0-0   withr_2.3.0        tidyselect_1.1.0   mnormt_2.0.2       curl_4.3           compiler_4.0.3     cli_2.2.0         
 [15] flextable_0.6.1    xml2_1.3.2         officer_0.3.15     labeling_0.4.2     scales_1.1.1       lmtest_0.9-38      psych_2.0.12      
 [22] readr_1.4.0        askpass_1.1        systemfonts_0.3.2  stringr_1.4.0      digest_0.6.27      foreign_0.8-80     editData_0.1.2    
 [29] rmarkdown_2.6      rio_0.5.16         base64enc_0.1-3    pkgconfig_2.0.3    htmltools_0.5.0    fastmap_1.0.1      rvg_0.2.5         
 [36] htmlwidgets_1.5.3  rlang_0.4.9        readxl_1.3.1       rstudioapi_0.13    farver_2.0.3       generics_0.1.0     zoo_1.8-8         
 [43] jsonlite_1.7.2     crosstalk_1.1.0.1  zip_2.1.1          car_3.0-10         magrittr_2.0.1     credentials_1.3.0  fansi_0.4.1       
 [50] Rcpp_1.0.5         munsell_0.5.0      abind_1.4-5        gdtools_0.2.2      lifecycle_0.2.0    yaml_2.2.1         stringi_1.5.3     
 [57] carData_3.0-4      MASS_7.3-53        grid_4.0.3         parallel_4.0.3     promises_1.1.1     sjmisc_2.8.5       forcats_0.5.0     
 [64] crayon_1.3.4       miniUI_0.1.1.1     lattice_0.20-41    haven_2.3.1        hms_0.5.3          sys_3.4            tmvnsim_1.0-2     
 [71] knitr_1.30         pillar_1.4.7       ggpubr_0.4.0       uuid_0.1-4         ggsignif_0.6.0     glue_1.4.2         packrat_0.5.0     
 [78] evaluate_0.14      data.table_1.13.4  vcd_1.4-8          vctrs_0.3.5        tweenr_1.0.1       httpuv_1.5.4       cellranger_1.1.0  
 [85] gtable_0.3.0       openssl_1.4.3      purrr_0.3.4        polyclip_1.10-0    assertthat_0.2.1   xfun_0.19          ggforce_0.3.2     
 [92] openxlsx_4.2.3     mime_0.9           xtable_1.8-4       broom_0.7.3        rstatix_0.6.0      later_1.1.0.1      rsconnect_0.8.16  
 [99] tibble_3.0.4       rrtable_0.2.1      ellipsis_0.3.1     ztable_0.2.2       devEMF_4.0-2      
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