[R-sig-Debian] How to install libisl.so.19 on chromebook?

[Luigi Marongiu]

I am trying to install minpack.lm on R 3.3.3 (Debian version) on a
Chromebook. But I get this error:
```
> install.packages("minpack.lm")
Installing package into ‘/home/marongiuluigi/R/x86_64-pc-linux-gnu-library/3.3’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/src/contrib/minpack.lm_1.2-1.tar.gz'
Content type 'application/x-gzip' length 43029 bytes (42 KB)
==================================================
downloaded 42 KB

* installing *source* package ‘minpack.lm’ ...
** package ‘minpack.lm’ successfully unpacked and MD5 sums checked
** libs
gfortran   -fpic  -g -O2 -fdebug-prefix-map=/build/r-base-3.3.3=.
-fstack-protector-strong  -c chkder.f -o chkder.o
/usr/local/libexec/gcc/x86_64-cros-linux-gnu/8.3.0/f951: error while
loading shared libraries: libisl.so.19: cannot open shared object
file: No such file or directory
/usr/lib/R/etc/Makeconf:155: recipe for target 'chkder.o' failed
make: *** [chkder.o] Error 1
ERROR: compilation failed for package ‘minpack.lm’
* removing ‘/home/marongiuluigi/R/x86_64-pc-linux-gnu-library/3.3/minpack.lm’
Warning in install.packages :
  installation of package ‘minpack.lm’ had non-zero exit status
```
I tried to install  libisl.so.19 but:
```
$ sudo apt-get install libisl.so.19
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libisl.so.19
E: Couldn't find any package by glob 'libisl.so.19'
E: Couldn't find any package by regex 'libisl.so.19'
```
I downloaded libisl.so.19 for debian, but where shall I place it?
Is there an easier way to install this library?
Thank you

-- 
Best regards,
Luigi