This seems to be entangled with the r-base transition.

The package build fails in dh_clean. We can reproduce it by simply
running 'make clean':

Package libR was not found in the pkg-config search path.
Perhaps you should add the directory containing `libR.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libR', required by 'virtual:world', not found
make: *** No rule to make target 'clean'.  Stop.

Here is the failing command:
pkg-config --cflags-only-I libR

Running it in debug mode, we can see the following warnings:

/usr/lib/pkgconfig/libR.pc: warning: file does not declare a `Name' field
/usr/lib/pkgconfig/libR.pc: warning: file does not declare a `Description' field
/usr/lib/pkgconfig/libR.pc: warning: file does not declare a `Version' field
/usr/lib/pkgconfig/libR.pc: warning: skipping invalid file


Finally, checking /usr/lib/pkgconfig/libR.pc, we realize that the file is empty 
for r-base-core_4.5.2-1build1_amd64.deb in the proposed pocket. however, 
r-base-core_4.5.2-1_amd64.deb (in the release pocket), has the following 
contents:

$ cat old/usr/lib/pkgconfig/libR.pc 
rhome=/usr/lib/R
rlibdir=${rhome}/lib
rincludedir=/usr/share/R/include

Name: libR
Description: R as a library
Version: 4.5.2
Libs: -Wl,--export-dynamic -fopenmp  -Wl,-Bsymbolic-functions -flto=auto 
-ffat-lto-objects -Wl,-z,relro -L${rlibdir} -lR
Cflags: -I${rincludedir} -I${rincludedir}
Libs.private:

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https://bugs.launchpad.net/bugs/2138343

Title:
  plr DEP8 segfaults on s390x

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