VirtulaBox 7.0.6上に、Ubuntu 22.04とYocto（krogothブランチ）を設定し、ルネサスのR-Carレイヤーをダウンロードして
＄bitbake core-image-minimal したところ、ログファイルlog.do_compile.3465に以下のエラーメッセージが出力されました。
c-stack.ct等のソースコードには問題ないようです。海外のサイトも見てみましたが具体的にどうすれば良いかわかりません。
対策をご教示頂きたく、投稿しました。
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EBUG: Executing shell function do_compile
NOTE: make -j 2 infodir=/home/ncos/poky/build/tmp/sysroots/x86_64-linux/usr/share/info
make all-recursive
make[1]: Entering directory '/home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/build'
Making all in .
make[2]: Entering directory '/home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/build'
make[2]: Nothing to be done for 'all-am'.
make[2]: Leaving directory '/home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/build'
Making all in examples
make[2]: Entering directory '/home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/build/examples'
make[2]: Nothing to be done for 'all'.
make[2]: Leaving directory '/home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/build/examples'
Making all in lib
make[2]: Entering directory '/home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/build/lib'
make all-am
make[3]: Entering directory '/home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/build/lib'
gcc -I. -I../../m4-1.4.17/lib -isystem/home/ncos/poky/build/tmp/sysroots/x86_64-linux/usr/include -isystem/home/ncos/poky/build/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe -c -o c-stack.o ../../m4-1.4.17/lib/c-stack.c
gcc -I. -I../../m4-1.4.17/lib -isystem/home/ncos/poky/build/tmp/sysroots/x86_64-linux/usr/include -isystem/home/ncos/poky/build/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe -c -o closeout.o ../../m4-1.4.17/lib/closeout.c
In file included from /usr/include/signal.h:328,
from ./signal.h:52,
from ../../m4-1.4.17/lib/c-stack.c:49:
../../m4-1.4.17/lib/c-stack.c:55:26: error: missing binary operator before token "("
55 | #elif HAVE_LIBSIGSEGV && SIGSTKSZ < 16384
| ^~~~~~~~
make[3]: *** [Makefile:1842: c-stack.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory '/home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/build/lib'
make[2]: *** [Makefile:1602: all] Error 2
make[2]: Leaving directory '/home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/build/lib'
make[1]: *** [Makefile:1506: all-recursive] Error 1
make[1]: Leaving directory '/home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/build'
make: *** [Makefile:1461: all] Error 2
WARNING: exit code 1 from a shell command.
ERROR: oe_runmake failed
ERROR: Function failed: do_compile (log file is located at /home/ncos/poky/build/tmp/work/x86_64-linux/m4-native/1.4.17-r0/temp/log.do_compile.3465)