installing spam package is failing (spam_0.29-1)

The primary error seems to be:

  "Creating a new generic function for "diff" in "spam"
    Error in setGeneric(f, where = where) :
      must supply a function skeleton, explicitly or via an existing
function"

And the full output follows. Any thoughts on what may be happening
and/or how to work around the problem?

Thanks!

install.packages('fields')

Installing package(s) into ?/usr/local/lib/R/site-library?
(as ?lib? is unspecified)
--- Please select a CRAN mirror for use in this session ---
CRAN mirror

  1: Argentina (La Plata)      2: Argentina (Mendoza)
[...]

Selection: 1
also installing the dependency ?spam?

trying URL
'http://mirror.fcaglp.unlp.edu.ar/CRAN/src/contrib/spam_0.29-1.tar.gz'
Content type 'application/x-gzip' length 396179 bytes (386 Kb)
opened URL
==================================================
downloaded 386 Kb

trying URL
'http://mirror.fcaglp.unlp.edu.ar/CRAN/src/contrib/fields_6.6.3.tar.gz'
Content type 'application/x-gzip' length 2488570 bytes (2.4 Mb)
opened URL
==================================================
downloaded 2.4 Mb

* installing *source* package ?spam? ...
** libs
gfortran   -fpic  -O3 -pipe  -g -c bckslvmodified.f -o bckslvmodified.o
gfortran   -fpic  -O3 -pipe  -g -c cholmodified.f -o cholmodified.o
gfortran   -fpic  -O3 -pipe  -g -c dist.f -o dist.o
gfortran   -fpic  -O3 -pipe  -g -c fromsparsekit.f -o fromsparsekit.o
gfortran   -fpic  -O3 -pipe  -g -c kronecker.f -o kronecker.o
gfortran   -fpic  -O3 -pipe  -g -c permutation.f -o permutation.o
gfortran   -fpic  -O3 -pipe  -g -c rowcolstats.f -o rowcolstats.o
gfortran   -fpic  -O3 -pipe  -g -c spamown.f -o spamown.o
gfortran   -fpic  -O3 -pipe  -g -c spamown2.f -o spamown2.o
gfortran   -fpic  -O3 -pipe  -g -c xybind.f -o xybind.o
gcc -shared -o spam.so bckslvmodified.o cholmodified.o dist.o
fromsparsekit.o kronecker.o permutation.o rowcolstats.o s\
pamown.o spamown2.o xybind.o -lgfortran -lm -lquadmath -L/usr/lib/R/lib -lR
installing to /usr/local/lib/R/site-library/spam/libs
** R
** data
**  moving datasets to lazyload DB
** demo
** inst

** preparing package for lazy loading
Creating a new generic function for "print" in "spam"
Creating a new generic function for "summary" in "spam"
Creating a new generic function for "diag" in "spam"
Creating a new generic function for "diag<-" in "spam"
Creating a new generic function for "t" in "spam"
Creating a new generic function for "as.matrix" in "spam"
Creating a new generic function for "all.equal" in "spam"
Creating a new generic function for "isSymmetric" in "spam"
Creating a new generic function for "diff" in "spam"
Error in setGeneric(f, where = where) :
   must supply a function skeleton, explicitly or via an existing function
Error : unable to load R code in package 'spam'
ERROR: lazy loading failed for package ?spam?
* removing ?/usr/local/lib/R/site-library/spam?
ERROR: dependency ?spam? is not available for package ?fields?
* removing ?/usr/local/lib/R/site-library/fields?

The downloaded packages are in
	?/tmp/RtmpauQxtX/downloaded_packages?
Warning messages:
1: In install.packages("fields") :
   installation of package 'spam' had non-zero exit status
2: In install.packages("fields") :
   installation of package 'fields' had non-zero exit status

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