错误：dyn.load(file, DLLpath = DLLpath, ...) 中的“gmm”的包或命名空间加载失败：无法加载共享对象

我已经将R的版本上传到4.0.2（2020-06-22）。 当我需要时安装 gmm 包后，我收到以下消息。我还为其他软件包（例如 TropFishR）采纳了此消息。我有 Xcode 10.3 。我重新安装了R studio和R几次。非常感谢您的宝贵时间。

错误信息：

Error: package or namespace load failed for ‘gmm’ in dyn.load(file, DLLpath = DLLpath, ...):
 unable to load shared object '/Library/Frameworks/R.framework/Versions/4.0/Resources/library/gmm/libs/gmm.so':
  dlopen(/Library/Frameworks/R.framework/Versions/4.0/Resources/library/gmm/libs/gmm.so, 6): Library not loaded: /usr/local/gfortran/lib/libgomp.1.dylib
  Referenced from: /Library/Frameworks/R.framework/Versions/4.0/Resources/library/gmm/libs/gmm.so
  Reason: image not found


session info:

 version 4.0.2 (2020-06-22)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Mojave 10.14.6

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils    
[5] datasets  methods   base     

other attached packages:
[1] sandwich_2.5-1

loaded via a namespace (and not attached):
[1] zoo_1.8-8       compiler_4.0.2 
[3] tools_4.0.2     grid_4.0.2     
[5] lattice_0.20-41

问题的产生是因为Library not loaded: /usr/local/gfortran/lib/libgomp.1.dylib被错过了。

为了解决这个问题，我去了this https://github.com/fxcoudert/gfortran-for-macOS/releasesGithub发布页面，已下载gfortran-10.2-Catalina.dmg，并安装了它。然后我终于可以加载了gmmR 中的包。