Error installing package ClassInt

Hi, trying to install ClassInt using RStudio and I see the following error:

"* installing *source* package ‘classInt’ ...
** package ‘classInt’ successfully unpacked and MD5 sums checked
** using staged installation
** libs
gfortran -fno-optimize-sibling-calls  -fPIC  -O2  -pipe -Wformat -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector --param=ssp-buffer-size=4  -c fish1.f -o fish1.o
f951: Warning: command-line option ‘-Wformat=1’ is valid for C/C++/ObjC/ObjC++ but not for Fortran

Is that a bug in the package or a problem elsewhere?


What is your Operating System please ?


it's linux:

Operating System: PCLinuxOS 2020
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.1
Kernel Version: 5.9.4-pclos1
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-4710HQ CPU @ 2.50GHz
Memory: 15.6 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4600


Thanks, in your Linux terminal, what gfortran version do you have ?

> gfortran --version

GNU Fortran (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)

[dave@localhost ~]$ gfortran --version
GNU Fortran (PCLinuxOS 10.2.0-2pclos2020) 10.2.0

Hmmm, I'm out of ideas.
If I were in your shoes I would raise an issue at


OK, thank you very much for looking


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