--- inst/include/absl/random/internal/platform.h	2023-10-02 03:46:17.000000000 +0800
+++ inst/include/absl/random/internal/platform.h	2023-10-02 03:50:51.000000000 +0800
@@ -67,8 +67,8 @@
 #define ABSL_ARCH_AARCH64
 #elif defined(__arm__) || defined(__ARMEL__) || defined(_M_ARM)
 #define ABSL_ARCH_ARM
-#elif defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \
-    defined(__ppc__) || defined(__PPC__)
+#elif defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__) || \
+    defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) || defined(__POWERPC__)
 #define ABSL_ARCH_PPC
 #else
 // Unsupported architecture.
@@ -105,9 +105,9 @@
 
 #elif defined(ABSL_ARCH_PPC)
 
-// Rely on VSX and CRYPTO extensions for vcipher on PowerPC.
-#if (defined(__VEC__) || defined(__ALTIVEC__)) && defined(__VSX__) && \
-    defined(__CRYPTO__)
+// Rely on VSX and CRYPTO extensions for vcipher on PowerPC, but not on Darwin.
+#if ((defined(__VEC__) || defined(__ALTIVEC__)) && defined(__VSX__) && \
+    defined(__CRYPTO__)) && !defined(__APPLE__)
 #undef ABSL_HAVE_ACCELERATED_AES
 #define ABSL_HAVE_ACCELERATED_AES 1
 #endif