--- vendor/eigen/Eigen/Core.orig	2023-06-13 02:32:24.000000000 +0800
+++ vendor/eigen/Eigen/Core	2023-07-21 08:04:23.000000000 +0800
@@ -125,6 +125,10 @@
   #endif
 #endif
 
+#if defined(__APPLE__) && defined(__POWERPC__)
+#undef EIGEN_VECTORIZE_ALTIVEC
+#undef EIGEN_VECTORIZE_VSX
+#endif
 
 #if defined EIGEN2_SUPPORT_STAGE40_FULL_EIGEN3_STRICTNESS || defined EIGEN2_SUPPORT_STAGE30_FULL_EIGEN3_API || defined EIGEN2_SUPPORT_STAGE20_RESOLVE_API_CONFLICTS || defined EIGEN2_SUPPORT_STAGE10_FULL_EIGEN2_API || defined EIGEN2_SUPPORT
 // This will generate an error message: