I can confirm this. Here is the build error:
make[2]: Entering directory '/home/collinfunk/libgcrypt-1.11.1/cipher' `echo /bin/bash ../libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I.. -I../src -I../src -I../mpi -I../mpi -I/home/collinfunk/tmp/include -g -O2 -fvisibility=hidden -fno-delete-null-pointer-checks -Wall -O2 -march=rv64imafdcv -mstrict-align -c rijndael-vp-riscv.c | sed -e 's/-fsanitize[=,\-][=,a-z,A-Z,0-9,\,,\-]*//g' -e 's/-fprofile[=,\-][=,a-z,A-Z,0-9,\,,\-]*//g' -e 's/-fcoverage[=,\-][=,a-z,A-Z,0-9,\,,\-]*//g' ` libtool: compile: gcc -DHAVE_CONFIG_H -I. -I.. -I../src -I../src -I../mpi -I../mpi -I/home/collinfunk/tmp/include -g -O2 -fvisibility=hidden -fno-delete-null-pointer-checks -Wall -O2 -march=rv64imafdcv -mstrict-align -c rijndael-vp-riscv.c -fPIC -DPIC -o .libs/rijndael-vp-riscv.o rijndael-vp-riscv.c:58:10: fatal error: simd-common-riscv.h: No such file or directory 58 | #include "simd-common-riscv.h" | ^~~~~~~~~~~~~~~~~~~~~ compilation terminated. make[2]: *** [Makefile:1730: rijndael-vp-riscv.lo] Error 1
Patch here: https://lists.gnupg.org/pipermail/gcrypt-devel/2025-May/005854.html