diff -urEb openssl-3.1.0.orig/providers/implementations/rands/seeding/rand_unix.c openssl-3.1.0/providers/implementations/rands/seeding/rand_unix.c
--- openssl-3.1.0.orig/providers/implementations/rands/seeding/rand_unix.c	2023-04-04 09:23:30.574295136 +0200
+++ openssl-3.1.0/providers/implementations/rands/seeding/rand_unix.c	2023-04-04 09:23:57.766784026 +0200
@@ -452,6 +452,7 @@
              * system call and this should always succeed which renders
              * this alternative but essentially identical source moot.
              */
+#if !defined(__LSB_VERSION__)  // "syscall()" is not available in LSB
             if (uname(&un) == 0) {
                 kernel[0] = atoi(un.release);
                 p = strchr(un.release, '.');
@@ -462,6 +463,7 @@
                     return 0;
                 }
             }
+#endif
             /* Open /dev/random and wait for it to be readable */
             if ((fd = open(DEVRANDOM_WAIT, O_RDONLY)) != -1) {
                 if (DEVRANDM_WAIT_USE_SELECT && fd < FD_SETSIZE) {