Error(s) in re-building vignettes:
  ...
--- re-building ‘discrete.Rmd’ using rmarkdown
Quitting from lines 192-194 (discrete.Rmd) 
Error: processing vignette ‘discrete.Rmd’ failed with diagnostics:
System command 'R' failed, exit status: 1, stdout + stderr:
E> * installing *source* package ‘discrete.deterministic.sir7184bd4d’ ...
E> ** using staged installation
E> ** libs
E> make[1]: Entering directory '/home/hornik/tmp/scratch/RtmpC8Br0m/file24609434d53984/src'
E> gcc-12 -I"/home/hornik/tmp/R.check/r-devel-gcc/Work/build/include" -DNDEBUG   -I/usr/local/include -D_FORTIFY_SOURCE=2   -fpic  -g -O2 -Wall -pedantic -mtune=native  -c odin.c -o odin.o
E> odin.c: In function ‘discrete_deterministic_sir_metadata’:
E> odin.c:114:40: warning: unused variable ‘internal’ [-Wunused-variable]
E>   114 |   discrete_deterministic_sir_internal *internal = discrete_deterministic_sir_get_internal(internal_p, 1);
E>       |                                        ^~~~~~~~
E> odin.c: In function ‘scalar_int’:
E> odin.c:285:31: error: ‘DOUBLE_EPS’ undeclared (first use in this function)
E>   285 |     if (fabs(rx - ret) > sqrt(DOUBLE_EPS)) {
E>       |                               ^~~~~~~~~~
E> odin.c:285:31: note: each undeclared identifier is reported only once for each function it appears in
E> make[1]: *** [/home/hornik/tmp/R.check/r-devel-gcc/Work/build/etc/Makeconf:169: odin.o] Error 1
E> make[1]: Leaving directory '/home/hornik/tmp/scratch/RtmpC8Br0m/file24609434d53984/src'
E> ERROR: compilation failed for package ‘discrete.deterministic.sir7184bd4d’
E> * removing ‘/home/hornik/tmp/scratch/RtmpC8Br0m/devtools_install_246094650c65b2/discrete.deterministic.sir7184bd4d’
--- failed re-building ‘discrete.Rmd’

--- re-building ‘functions.Rmd’ using rmarkdown
--- finished re-building ‘functions.Rmd’

--- re-building ‘odin.Rmd’ using rmarkdown
--- finished re-building ‘odin.Rmd’

SUMMARY: processing the following file failed:
  ‘discrete.Rmd’

Error: Vignette re-building failed.
Execution halted