failed to install.packages("gifski")

[IvanProdaiko94]

error appeared while installing the gifski package

install.packages("gifski")
trying URL 'https://cloud.r-project.org/src/contrib/gifski_0.8.6.tar.gz'
Content type 'application/x-gzip' length 12142 bytes (11 KB)
==================================================
downloaded 11 KB

During startup - Warning messages:
1: Setting LC_TIME failed, using "C"
2: Setting LC_MESSAGES failed, using "C"
3: Setting LC_MONETARY failed, using "C"
* installing *source* package ‘gifski’ ...
** package ‘gifski’ successfully unpacked and MD5 sums checked
Using /Users/ivanprodaiko/.cargo/bin/cargo (cargo 1.34.0 (6789d8a0a 2019-04-01))
** libs
clang -I"/usr/local/Cellar/r/3.5.3/lib/R/include" -DNDEBUG   -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -I/usr/local/include  -pthread  -fPIC  -g -O2  -c wrapper.c -o wrapper.o
/Users/ivanprodaiko/.cargo/bin/cargo build --release --manifest-path=myrustlib/Cargo.toml
    Updating crates.io index
error: failed to fetch `https://github.com/rust-lang/crates.io-index`

Caused by:
  failed to authenticate when downloading repository
attempted ssh-agent authentication, but none of the usernames `git` succeeded

Caused by:
  no authentication available
make: *** [myrustlib/target/release/libmyrustlib.a] Error 101
ERROR: compilation failed for package ‘gifski’
* removing ‘/usr/local/Cellar/r/3.5.3/lib/R/library/gifski’

The downloaded source packages are in
    ‘/private/tmp/RtmplpsL1C/downloaded_packages’
Updating HTML index of packages in '.Library'
Making 'packages.html' ... done
Warning message:
In install.packages("gifski") :
  installation of package ‘gifski’ had non-zero exit status

[jeroen]

Looks like your git is not working, what do you see for?

git clone https://github.com/rust-lang/crates.io-index