try fixing patch

8.2/sid/cli/Dockerfile

@@ -96,6 +96,7 @@ RUN set -eux; \
 	apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false
 
 COPY docker-php-source /usr/local/bin/
+COPY latomic.patch /
 
 RUN set -eux; \
 	\
@@ -126,6 +127,8 @@ RUN set -eux; \
 	if [ ! -d /usr/include/curl ]; then \
 		ln -sT "/usr/include/$debMultiarch/curl" /usr/local/include/curl; \
 	fi; \
+        patch -p1 < /latomic.patch; \
+        rm /latomic.patch; \
 	./configure \
 		--build="$gnuArch" \
 		--with-config-file-path="$PHP_INI_DIR" \

latomic.patch

@@ -0,0 +1,21 @@
+diff --git a/configure.ac b/configure.ac
+index fcb6297238..0a475ed80f 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -373,6 +373,16 @@ if test "$ac_cv_func_dlopen" = "yes"; then
+ fi
+ AC_CHECK_LIB(m, sin)
+ 
++case $host_alias in
++  riscv64*)
++    AC_CHECK_LIB(atomic, __atomic_exchange_1, [
++      PHP_ADD_LIBRARY(atomic)
++    ], [
++      AC_MSG_ERROR([Problem with enabling atomic. Please check config.log for details.])
++    ])
++    ;;
++esac
++
+ dnl Check for inet_aton in -lc, -lbind and -lresolv.
+ PHP_CHECK_FUNC(inet_aton, resolv, bind)
+