--- OOps/pffft.c	2024-01-04 19:36:34.000000000 +0800
+++ OOps/pffft.c	2024-01-04 19:32:28.000000000 +0800
@@ -103,6 +103,8 @@
    Altivec support macros
 */
 #if !defined(PFFFT_SIMD_DISABLE) && (defined(__ppc__) || defined(__ppc64__))
+#include <altivec.h>
+
 typedef vector float v4sf;
 #  define SIMD_SZ 4
 #  define VZERO() ((vector float) vec_splat_u8(0))