Help with Error - No

I am not versed in using code, I simply need to use this program for my public health class to calculate some Data. I am trying to Run the RQDA program on my Max OS 10.14.6 Mojave. If you have nay suggestions on how to advance past the error below that would be greatly appreciated.

R version 3.6.3 (2020-02-29) -- "Holding the Windsock"
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library(RQDA)
Loading required package: RSQLite
Loading required package: gWidgetsRGtk2
Loading required package: RGtk2
Loading required package: gWidgets
Error: package ‘cairoDevice’ required by ‘gWidgetsRGtk2’ could not be found

Try running

install.packages("gWidgetsRGtk2")

and then rerunning library(RQDA).

Thanks, I did as instructed. This is the message i got on my end.

install.packages("gWidgetsRGtk2")
also installing the dependency ‘cairoDevice’

There is a binary version available but the source version is later:
binary source needs_compilation
cairoDevice 2.27 2.28 TRUE

Do you want to install from sources the package which needs compilation? (Yes/no/cancel) Yes
trying URL 'https://cran.rstudio.com/bin/macosx/el-capitan/contrib/3.6/gWidgetsRGtk2_0.0-86.tgz'
Content type 'application/x-gzip' length 1328951 bytes (1.3 MB)

downloaded 1.3 MB

The downloaded binary packages are in
/var/folders/34/km0_883d277dmfrfq66spjgh0000gn/T//RtmpW142rx/downloaded_packages
installing the source package ‘cairoDevice’

trying URL 'https://cran.rstudio.com/src/contrib/cairoDevice_2.28.tar.gz'
Content type 'application/x-gzip' length 40711 bytes (39 KB)

downloaded 39 KB

  • installing source package ‘cairoDevice’ ...
    ** package ‘cairoDevice’ successfully unpacked and MD5 sums checked
    ** using staged installation
    checking for pkg-config... no
    ERROR: Cannot find pkg-config.
    ERROR: configuration failed for package ‘cairoDevice’
  • removing ‘/Library/Frameworks/R.framework/Versions/3.6/Resources/library/cairoDevice’
    Warning in install.packages :
    installation of package ‘cairoDevice’ had non-zero exit status

The downloaded source packages are in
‘/private/var/folders/34/km0_883d277dmfrfq66spjgh0000gn/T/RtmpW142rx/downloaded_packages’

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Maybe it is a problem with your graphics device at a system level, try installing/reinstalling xquartz
https://www.xquartz.org/