R 4.3.2版本中安装RStoolbox包失败的问题求助

大家好，我最近在R 4.3.2版本里安装RStoolbox包时接连踩坑，折腾半天都没搞定，来这儿求助各位大佬！

首先我尝试通过CRAN官方源安装，运行了这段代码：

install.packages("RStoolbox")

结果直接弹出警告，说这个包不兼容我当前的R版本：

Warning in install.packages :
package ‘RStoolbox’ is not available for this version of R
A version of this package for your version of R might be available elsewhere,
see the ideas at
https://cran.r-project.org/doc/manuals/r-patched/R-admin.html#Installing-packages

后来我查了资料，说可以用devtools从GitHub安装开发版试试。我先装好devtools之后，运行了下面的代码：

library(devtools)
install_github("bleutner/RStoolbox")

结果这次又栽在了编译环节，一堆报错信息跳出来，关键内容是：

ld: warning: directory not found for option '-L/opt/gfortran/lib/gcc/x86_64-apple-darwin20.0/12.2.0'
ld: warning: directory not found for option '-L/opt/gfortran/lib'
ld: library not found for -lgfortran
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [RStoolbox.so] Error 1
ERROR: compilation failed for package ‘RStoolbox’

• removing ‘/Library/Frameworks/R.framework/Versions/4.3-x86_64/Resources/library/RStoolbox’
  Warning message:
  In i.p(...) :
  installation of package ‘/var/folders/dz/hfv4f1hd73j_0hnn3551kc5h0000gn/T//RtmpxVCBIG/file23d12d40b3cd/RStoolbox_0.3.1.9999.tar.gz’ had non-zero exit status

看起来是找不到gfortran相关的库，但我用的是Mac系统，完全搞不懂该怎么正确配置这个环境。有没有大佬能给我一步步的解决步骤呀？真的非常感谢！

备注：内容来源于stack exchange，提问作者Wei Liao