关于r：devtools :: install_git无法在Depends或Imports中安装软件包的依赖项

devtools::install_git fails to install dependencies of packages in Depends or Imports

我有一个依赖于软件包extrafont的软件包。如果用户系统上不存在extrafont及其依赖项Rttf2pt1，则我的软件包安装失败。我的软件包的DESCRIPTION文件中有extrafont作为" Depends"。当我运行devtools::install_git()从URL安装我的软件包时，输出终止于：

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** preparing package for lazy loading
Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) :
there is no package called 'Rttf2pt1'
Error : package 'extrafont' could not be loaded
ERROR: lazy loading failed for package 'tntpr'
* removing 'C:/Users/SFirke/Documents/R/win-library/3.3/tntpr'

看起来像Extrafont可以很好地安装，但是由于Rttf2pt1丢失而无法正常工作。当我将Rttf2pt1添加到我的Description文件的Depends列表中时，安装成功，同时安装了extrafont和Rttf2pt1以及我的软件包。

为什么需要在我的"依赖"列表中放入" Rttf2pt1"？它存在于extrafont包中的Description文件中的"导入"列表中：

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Depends:
R (>= 2.15)
Imports:
extrafontdb,
grDevices,
utils,
Rttf2pt1

其他信息

运行devtools::install_git("https://myurl.com/tntpr.git", dependencies = TRUE)时，得到以下输出。它从GitHub安装dplyr，然后安装extrafonts，然后无法加载我的包：

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Installing tntpr
Downloading GitHub repo hadley/dplyr@master
from URL https://api.github.com/repos/hadley/dplyr/zipball/master
Installing dplyr
"C:/PROGRA~1/R/R-33~1.2/bin/x64/R" --no-site-file --no-environ --no-save --no-restore --quiet CMD INSTALL \\
"C:/Users/SFirke/AppData/Local/Temp/RtmpMlRSSR/devtools3dfc4e39620/hadley-dplyr-5902277" --library="C:/Users/SFirke/Documents/R/win-library/3.3" --install-tests

* installing *source* package 'dplyr' ...
** libs

*** arch - i386
C:/RBuildTools/3.4/mingw_32/bin/g++ -I"C:/PROGRA~1/R/R-33~1.2/include" -DNDEBUG -I../inst/include -DCOMPILING_DPLYR -I"C:/Users/SFirke/Documents/R/win-library/3.3/Rcpp/include" -I"C:/Users/SFirke/Documents/R/win-library/3.3/BH/include" -I"C:/Users/SFirke/Documents/R/win-library/3.3/bindrcpp/include" -I"C:/Users/SFirke/Documents/R/win-library/3.3/plogr/include" -I"d:/Compiler/gcc-4.9.3/local330/include" -O2 -Wall -mtune=core2 -c RcppExports.cpp -o RcppExports.o
<--- lots more lines like this ^^^^^ --->
** R
** data
*** moving datasets to lazyload DB
** inst
** tests
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** installing vignettes
** testing if installed package can be loaded
*** arch - i386
*** arch - x64
* DONE (dplyr)
Installing 1 package: extrafont
Installing package into a€?C:/Users/SFirke/Documents/R/win-library/3.3a€?
(as a€?liba€? is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.3/extrafont_0.17.zip'
Content type 'application/zip' length 34323 bytes (33 KB)
downloaded 33 KB

package a€?extrafonta€? successfully unpacked and MD5 sums checked

The downloaded binary packages are in
C:\\Users\\SFirke\\AppData\\Local\\Temp\
tmpMlRSSR\\downloaded_packages
"C:/PROGRA~1/R/R-33~1.2/bin/x64/R" --no-site-file --no-environ --no-save --no-restore --quiet CMD INSTALL"C:/Users/SFirke/AppData/Local/Temp/RtmpMlRSSR/file3dfc4a973a21" \\
--library="C:/Users/SFirke/Documents/R/win-library/3.3" --install-tests

* installing *source* package 'tntpr' ...
** R
** data
*** moving datasets to lazyload DB
** inst
** tests
** preparing package for lazy loading
Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) :
there is no package called 'Rttf2pt1'
Error : package 'extrafont' could not be loaded
ERROR: lazy loading failed for package 'tntpr'
* removing 'C:/Users/SFirke/Documents/R/win-library/3.3/tntpr'
Error: Command failed (1)