R help - Apr 2018 - Package ddalpha is not building for me in R 3.5.0

I was updating packages after upgrading R to 3.5.0 and one package, 
ddalpha, that is dependency for caret is not building. All the compiled 
code builds but something seems to start going wrong at the byte-compile 
stage. Here is the error and sessionInfo(). My computer has 8 GB of RAM, 
by the way. Has anyone else encountered this?

** R
** data
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
Error in system2(file.path(R.home("bin"), "R"), c(if
(nzchar(arch))
paste0("--arch=",  :
   cannot popen ' '/usr/local/lib64/R/bin/R' --no-save --slave
2>&1 <
'/tmp/RtmpZB2yyH/file64c65776e871'', probable reason 'Cannot
allocate
memory'
* removing ?/usr/local/lib64/R/library/ddalpha?
Warning in q("no", status = status, runLast = FALSE) :
   system call failed: Cannot allocate memory
> sessionInfo()
R version 3.5.0 Patched (2018-04-23 r74633)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Slackware 14.2 x86_64 (post 14.2 -current)

Matrix products: default
BLAS: /usr/local/lib64/R/lib/libRblas.so
LAPACK: /usr/local/lib64/R/lib/libRlapack.so

locale:
  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
  [3] LC_TIME=en_US.UTF-8        LC_COLLATE=C
  [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
  [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
  [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] compiler_3.5.0 tools_3.5.0    tcltk_3.5.0


-- 
Kevin E. Thorpe
Head of Biostatistics,  Applied Health Research Centre (AHRC)
Li Ka Shing Knowledge Institute of St. Michael's Hospital
Assistant Professor, Dalla Lana School of Public Health
University of Toronto
email: kevin.thorpe at utoronto.ca  Tel: 416.864.5776  Fax: 416.864.3016