perl-Text-Kakasi-2.04-59.fc43 fails to build in Fedora 43:

gcc -c  -I/usr/local/include -D_REENTRANT -D_GNU_SOURCE -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Wno-complain-wrong-lang -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -mtls-dialect=gnu2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -fwrapv -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Wno-complain-wrong-lang -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -march=x86-64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -mtls-dialect=gnu2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer   -DVERSION=\"2.04\" -DXS_VERSION=\"2.04\" -fPIC "-I/usr/lib64/perl5/CORE"  -DWAKATIGAKI Kakasi.c
In file included from Kakasi.xs:33:
/usr/include/libkakasi.h:41:24: error: unknown type name ‘Character’
   41 | void digest_start_copy(Character *, Character *);
      |                        ^~~~~~~~~
[...]

A difference between passing and failing build root is at <https://koschei.fedoraproject.org/build/19579547>. An upgrade of kakasi-devel from 2.3.6-29.fc41 to 2.3.6-31.fc42 looks suspicious.