can't install devtools in my Rstudio Macos

i tried too much to install devtools on my mac R studio but id doesn't , and this is the error appears:

Warning in install.packages :
installation of package ‘devtools’ had non-zero exit status

The downloaded source packages are in
‘/private/var/folders/gj/b_jyp39x3191_5x00dbjkckh0000gn/T/RtmpSEJ4zH/downloaded_packages’
Updating HTML index of packages in '.Library'
Making 'packages.html' ... done

Can you post the complete error message you get? you are omitting the informative parts.

i tried this:

install.packages("devtools", type = "source")
trying URL 'https://cran.rstudio.com/src/contrib/devtools_2.3.2.tar.gz'
Content type 'application/x-gzip' length 373387 bytes (364 KB)
==================================================
downloaded 364 KB

  • installing source package ‘devtools’ ...
    ** package ‘devtools’ successfully unpacked and MD5 sums checked
    ** using staged installation
    ** R
    ** inst
    ** byte-compile and prepare package for lazy loading
    ** help
    *** installing help indices
    *** copying figures
    ** building package indices
    ** installing vignettes
    ** testing if installed package can be loaded from temporary location
    ** testing if installed package can be loaded from final location
    ** testing if installed package keeps a record of temporary installation path
  • DONE (devtools)

The downloaded source packages are in
‘/private/var/folders/gj/b_jyp39x3191_5x00dbjkckh0000gn/T/RtmprpKSBz/downloaded_packages’

library(devtools)

but when try to use it it loading:
Loading required package: usethis

You are not showing any error message so far, can you post the complete output you get when you load devtools?