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The compilation of Rwcs crashes using either of

install_github("asgr/Rwcs")
or
install.packages('/home/cnaw/Rwcs_1.7.0.tar.gz',repos=NULL,type='source')
...
ar rU libwcs-PIC.a cel.o dis.o fitshdr.o lin.o log.o prj.o spc.o sph.o spx.o tab.o wcs.o wcsbth.o wcserr.o wcsfix.o wcshdr.o wcspih.o wcsprintf.o wcstrig.o wcsulex.o wcsunits.o wcsutil.o wcsutrn.o
ar: creating libwcs-PIC.a
make[1]: Leaving directory '/tmp/Rtmp72MZZJ/R.INSTALLb4e77cdac2f3/Rwcs/src/wcslib/C'
g++ -std=gnu++11 -shared -L/usr/lib64/R/lib -Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -Wl,--build-id=sha1 -o Rwcs.so RcppExports.o Rwcs.o pnpoly.o mat_diff_sum.o dilate.o wcslib/C/libwcs-PIC.a -L/usr/lib64/R/lib -lR
/usr/include/R/Rinternals.h:1107:7: error: variable ‘CAR’ redeclared as function
1107 | SEXP (CAR)(SEXP e);
| ^
wcslib/C/prj.c:71:11: note: previously declared here
71 | const int CAR = 203;
| ^
lto1: fatal error: errors during merging of translation units
compilation terminated.
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
make: *** [/usr/share/R/make/shlib.mk:10: Rwcs.so] Error 1
ERROR: compilation failed for package ‘Rwcs’

• removing ‘/usr/lib64/R/library/Rwcs’
  Warning message:
  In i.p(...) :
  installation of package ‘/tmp/RtmpWIwxEN/file145de8be1f9/Rwcs_1.7.0.tar.gz’ had non-zero exit status

I (re-) compiled Rwcs under R 4.2.3 and it completes normally. While there are differences between the Rinternals.h files of both versions of R none seem to involve CAR. Any suggestion on what could be the source of the problem?
Thanks!
Christopher Willmer

Rinternals_4.2.3.h.gz
Rinternals_4.3.2.h.gz