r - f951: internal compiler error: Illegal instruction: 4 - r

Question

I'm trying to install MVN package:
> install.packages("MVN")
probando la URL 'https://cran.rstudio.com/bin/macosx/el-capitan/contrib/3.5/MVN_5.5.tgz'
Content type 'application/x-gzip' length 382369 bytes (373 KB)
==================================================
downloaded 373 KB
The downloaded binary packages are in
/var/folders/79/xxghr9tj65789879v41wrp6h0000gn/T//Rtmp4bpod5/downloaded_packages
but when I do library(MVN) it says me that Error: package or namespace load failed for ‘MVN’ in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]): there is no package called ‘rrcov’
so when I try to install it:
> install.packages("rrcov")
There is a binary version available but the source version is later:
binary source needs_compilation
rrcov 1.4-4 1.4-7 TRUE
Do you want to install from sources the package which needs compilation? (Yes/no/cancel) yes
installing the source package ‘rrcov’
probando la URL 'https://cran.rstudio.com/src/contrib/rrcov_1.4-7.tar.gz'
Content type 'application/x-gzip' length 965680 bytes (943 KB)
==================================================
downloaded 943 KB
* installing *source* package ‘rrcov’ ...
** package ‘rrcov’ successfully unpacked and MD5 sums checked
** libs
clang -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/include -fPIC -Wall -g -O2 -c R-rng4ftn.c -o R-rng4ftn.o
clang -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/include -fPIC -Wall -g -O2 -c covOPW.c -o covOPW.o
gfortran -fPIC -g -O2 -c ds11.f -o ds11.o
gfortran: warning: couldn’t understand kern.osversion ‘15.6.0
f951: internal compiler error: Illegal instruction: 4
f951: internal compiler error: Abort trap: 6
gfortran: internal compiler error: Abort trap: 6 (program f951)
make: *** [ds11.o] Abort trap: 6
ERROR: compilation failed for package ‘rrcov’
* removing ‘/Library/Frameworks/R.framework/Versions/3.5/Resources/library/rrcov’
Warning in install.packages :
installation of package ‘rrcov’ had non-zero exit status
The downloaded source packages are in
‘/private/var/folders/79/xxghr9tj65789879v41wrp6h0000gn/T/Rtmp4bpod5/downloaded_packages’
I've searched how to fix that, installing XCode, reinstalling r, and nothing. I need this package to perfom some multivariate analysis for my thesis but I do not know how to fix it.
Any help will be appreciated.
Thanks!
I am using an iOS 10.11.6