难以安装R包pdftools

我正在尝试安装R软件包“pdftools”，并遇到以下问题：

In file included from libqpdf/Pl_DCT.cc:1:
include/qpdf/Pl_DCT.hh:27:10: fatal error: 'jpeglib.h' file not found
#include <jpeglib.h>
         ^
1 error generated.
make: *** [libqpdf/Pl_DCT.o] Error 1
ERROR: compilation failed for package ‘qpdf’

文件“jpeglib.h”似乎没有列出，但我在：/anaconda3/pkgs/jpeg-9b-he5867d9_2/include/jpeglib.h中找到了它

根据其他帖子，我尝试从终端：

然后重新启动并再次尝试安装pdftools，结果相同

我也看到了这篇文章，但它完全超出了我的理解范围：

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任何简单步骤的解决方案都值得赞赏

这是我的会话信息，由于限制，我无法将其包含在评论中

> sessionInfo()
R version 3.4.3 (2017-11-30)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS High Sierra 10.13.6

Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.4/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     datasets  methods  
[7] base     

other attached packages:
[1] pdftools_2.2

loaded via a namespace (and not attached):
[1] compiler_3.4.3 tools_3.4.3    pillar_1.2.1   tibble_1.4.2  
[5] Rcpp_1.0.1     qpdf_1.1       rlang_0.3.0.1  askpass_1.1

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我刚刚安装了pdftools，没有任何问题。升级R版本可能会解决您的问题

你好，我在我的mac电脑上试过了，安装起来没有任何问题。您是否安装了askpass软件包？对-我应该提到我无法更新到R3.6.1，因为目前我无法从OS X 10.10.5进行更新。找不到可以安装的更高版本的R（例如R 3.4.3）。有解决办法吗？您可以从该链接找到3.4.3和其他版本。如果对您有效，请不要忘记升级投票或接受答案，最好：）看起来R3.4.3需要更高版本的OS X，因此我暂时无法接受，除非有办法在编译过程中找到jpeglib.h。

$ brew install boost. (Lot of installing, no errors)
$ brew doctor (Lot of installing, no errors)
$ xcode-select: error: command line tools are already installed, use "Software Update" to install updates
$ brew install cairo gobject-introspection pixman (Lot of installing, no errors)

> sessionInfo()
R version 3.4.3 (2017-11-30)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS High Sierra 10.13.6

Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.4/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     datasets  methods  
[7] base     

other attached packages:
[1] pdftools_2.2

loaded via a namespace (and not attached):
[1] compiler_3.4.3 tools_3.4.3    pillar_1.2.1   tibble_1.4.2  
[5] Rcpp_1.0.1     qpdf_1.1       rlang_0.3.0.1  askpass_1.1