elifdef is C23
And the new clang complains (-Wc++23-extensions)
diff --git a/benchmarks/timing.h b/benchmarks/timing.h
index 066323e..2d4bf04 100644
--- a/benchmarks/timing.h
+++ b/benchmarks/timing.h
@@ -12,7 +12,7 @@
// On Sail, report the number of instructions, the cycle count is
// meaningless.
__asm__ volatile("csrr %0, minstret" : "=r"(cycles));
-#elifdef IBEX
+#elif defined(IBEX)
// CHERIoT-Ibex does not yet implement rdcycle, so read the CSR
// directly.
__asm__ volatile("csrr %0, mcycle" : "=r"(cycles));
