我无法在 R 3.3.0 上安装包 nloptr 1.0.4。消息如下：
> install.packages("nloptr")
Installing package into ‘/Users/fgomesbarros/Library/R/3.3/library
(as ‘lib’ is unspecified)
trying URL 'https://cran.revolutionanalytics.com/src/contrib/nloptr_1.0.4.tar.gz'
Content type 'application/octet-stream' length 353942 bytes (345 KB)
==================================================
downloaded 345 KB
* installing *source* package ‘nloptr’ ...
** package ‘nloptr’ successfully unpacked and MD5 sums checked
checking for g++... g++
checking whether the C++ compiler works... yes
checking for C++ compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for …