Problem with installation of vegan package - cannot find -lgfortran - r

Question

I was installing another package called vcfR where it says vegan is source package and needs to be installed, then it showed errors when installing. So I decided to install vegan package first.
This is an online R studio, the package I need to analyse is too big to be done on my laptop. The online R studio is by my school server, which was in-built in a ssh server account.
below is the error message:
Installing package into ‘/home/joyzheng/R/x86_64-pc-linux-gnu-library/4.0’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/src/contrib/vegan_2.5-7.tar.gz'
Content type 'application/x-gzip' length 2074611 bytes (2.0 MB)
==================================================
downloaded 2.0 MB
* installing *source* package ‘vegan’ ...
** package ‘vegan’ successfully unpacked and MD5 sums checked
** using staged installation
** libs
gcc -std=gnu99 -I"/opt/R/4.0.3/lib/R/include" -DNDEBUG -I/usr/local/include -fpic -g -O2 -c data2hill.c -o data2hill.o
gfortran -fpic -g -O2 -c decorana.f -o decorana.o
gcc -std=gnu99 -I"/opt/R/4.0.3/lib/R/include" -DNDEBUG -I/usr/local/include -fpic -g -O2 -c getF.c -o getF.o
gcc -std=gnu99 -I"/opt/R/4.0.3/lib/R/include" -DNDEBUG -I/usr/local/include -fpic -g -O2 -c goffactor.c -o goffactor.o
gcc -std=gnu99 -I"/opt/R/4.0.3/lib/R/include" -DNDEBUG -I/usr/local/include -fpic -g -O2 -c init.c -o init.o
gfortran -fpic -g -O2 -c monoMDS.f -o monoMDS.o
gcc -std=gnu99 -I"/opt/R/4.0.3/lib/R/include" -DNDEBUG -I/usr/local/include -fpic -g -O2 -c nestedness.c -o nestedness.o
gfortran -fpic -g -O2 -c ordering.f -o ordering.o
gcc -std=gnu99 -I"/opt/R/4.0.3/lib/R/include" -DNDEBUG -I/usr/local/include -fpic -g -O2 -c pnpoly.c -o pnpoly.o
gcc -std=gnu99 -I"/opt/R/4.0.3/lib/R/include" -DNDEBUG -I/usr/local/include -fpic -g -O2 -c stepacross.c -o stepacross.o
gcc -std=gnu99 -I"/opt/R/4.0.3/lib/R/include" -DNDEBUG -I/usr/local/include -fpic -g -O2 -c vegdist.c -o vegdist.o
gcc -std=gnu99 -shared -L/opt/R/4.0.3/lib/R/lib -L/usr/local/lib -o vegan.so data2hill.o decorana.o getF.o goffactor.o init.o monoMDS.o nestedness.o ordering.o pnpoly.o stepacross.o vegdist.o -L/opt/R/4.0.3/lib/R/lib -lRlapack -L/opt/R/4.0.3/lib/R/lib -lRblas -lgfortran -lm -lquadmath -lgfortran -lm -lquadmath -L/opt/R/4.0.3/lib/R/lib -lR
/usr/bin/ld: cannot find -lgfortran
/usr/bin/ld: cannot find -lgfortran
collect2: error: ld returned 1 exit status
make: *** [vegan.so] Error 1
ERROR: compilation failed for package ‘vegan’
* removing ‘/home/joyzheng/R/x86_64-pc-linux-gnu-library/4.0/vegan’
Warning in install.packages :
installation of package ‘vegan’ had non-zero exit status```