As per https://pegasus.isi.edu/documentation/dax_generator_api.php#api-r R API can be installed as below, but it reports an error.

R CMD install `pegasus-config --r`

$ R CMD install `pegasus-config --r`
install: missing destination file operand after `/usr/share/pegasus/r/dax3_3.6.0.tar.gz'
Try `install --help' for more information.

2. Adding a dest. dir after it simply copies the tar.gz file.

R CMD install `pegasus-config --r` /tmp/
[tutorial@541cd70df1b2 s]$ ls /tmp/
anaconda-post.log dax3_3.6.0.tar.gz hsperfdata_root hsperfdata_tutorial yum.log
[tutorial@541cd70df1b2 s]$ md5sum `pegasus-config --r` /tmp/dax3_3.6.0.tar.gz
b87d6dd51762122415622eca467316bf /usr/share/pegasus/r/dax3_3.6.0.tar.gz
b87d6dd51762122415622eca467316bf /tmp/dax3_3.6.0.tar.gz

Second approach works fine.