R安装glmnet需要在~/.R下设置Makevars

C++14 standard requested but CXX14 is not defined

$ vim ~/.R/Makevars
CXX14FLAGS=-O3 -march=native -mtune=native -fPIC
CXX14=g++

install.packages('glmnet', ask=F, update=F)
...
installing to /opt/R/R-4.0.2/lib64/R/library/00LOCK-glmnet/00new/glmnet/libs
** R
** data
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
*** copying figures
** building package indices
** installing vignettes
** testing if installed package can be loaded from temporary location
** checking absolute paths in shared objects and dynamic libraries
** testing if installed package can be loaded from final location
** testing if installed package keeps a record of temporary installation path
* DONE (glmnet)

The downloaded source packages are in
	‘/tmp/Rtmpa5W3si/downloaded_packages’
Updating HTML index of packages in '.Library'
Making 'packages.html' ... done
> 
> require(glmnet)
Loading required package: glmnet
Loading required package: Matrix

Attaching package: ‘Matrix’

The following object is masked from ‘package:S4Vectors’:

    expand

The following objects are masked from ‘package:tidyr’:

    expand, pack, unpack

Loaded glmnet 4.1-6
>