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我已经安装了包qdap[2.2.0] 和gtools[Ver. 3.4.1] 这qdap需要。但是加载它们library()失败，直到我每次都使用参数重新安装 gtools dependencies = TRUE。我做错了什么而不理解？

> library(qdap)
Error in library.dynam(lib, package, package.lib) : 
  DLL ‘gtools’ not found: maybe not installed for this architecture?
In addition: Warning message:
package ‘qdap’ was built under R version 3.1.2 
Error: package or namespace load failed for ‘qdap’
> library(gtools)
Error in library.dynam(lib, package, package.lib) : 
  DLL ‘gtools’ not found: maybe not installed for this architecture?
In addition: Warning message:
package ‘gtools’ was built under R version 3.1.2 
Error: package or namespace load failed for ‘gtools’
> 
> install.packages("gtools", dependencies = T)
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