Error in installing ShinyPsych

[ykunisato]

Hi, Everyone.
I got the error message in installing ShinyPsych.

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devtools::install_github("mdsteiner/ShinyPsych", build = TRUE, build_opts = c("--no-resave-data", "--no-manual"))

Downloading GitHub repo mdsteiner/ShinyPsych@master
Skipping 7 packages not available: shiny, shinyjs, retimes, rdrop2, digest, sendmailR, openssl
✔ checking for file ‘/tmp/RtmpNDzyc9/remotes113768bd5ce/mdsteiner-ShinyPsych-849c776/DESCRIPTION’ ...
─ preparing ‘ShinyPsych’:
✔ checking DESCRIPTION meta-information ...
─ checking for LF line-endings in source and make files and shell scripts
─ checking for empty or unneeded directories
─ building ‘ShinyPsych_0.2.3.tar.gz’

Installing package into ‘/usr/local/lib/R/site-library’
(as ‘lib’ is unspecified)
ERROR: dependencies ‘retimes’, ‘sendmailR’ are not available for package ‘ShinyPsych’
removing ‘/usr/local/lib/R/site-library/ShinyPsych’
Error: Failed to install 'ShinyPsych' from GitHub:
(converted from warning) installation of package ‘/tmp/RtmpNDzyc9/file113a0a3a1d/ShinyPsych_0.2.3.tar.gz’ had non-zero exit status
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My sessionInfo() is below.
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sessionInfo()
R version 3.6.1 (2019-07-05)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Debian GNU/Linux 9 (stretch)
####################

The dependencies ‘retimes’, ‘sendmailR’ may have installing error in R3.6.1.

[a9998945]

Package ‘retimes’ was removed from the CRAN repository. Formerly available versions can be obtained from the archive[https://cran.r-project.org/src/contrib/Archive/retimes/].