--- a/magick/studio.h
+++ b/magick/studio.h
@@ -51,7 +51,7 @@
   threads.  Most CPUs have cache lines of 32 or 64 bytes.  IBM Power CPUs have
   cache lines of 128 bytes.
 */
-#if defined(MAGICK_TARGET_CPU) && (MAGICK_TARGET_CPU == powerpc)
+#ifdef __powerpc__
 #  define MAGICK_CACHE_LINE_SIZE 128
 #else
 #  define MAGICK_CACHE_LINE_SIZE 64
--- a/configure.ac
+++ b/configure.ac
@@ -46,10 +46,6 @@
 dnl Compute the canonical host (run-time) system type variable
 AC_CANONICAL_HOST
 
-MAGICK_TARGET_CPU=$host_cpu
-AC_SUBST(MAGICK_TARGET_CPU)
-AC_DEFINE_UNQUOTED(MAGICK_TARGET_CPU,$MAGICK_TARGET_CPU,[Target Host CPU])
-
 MAGICK_TARGET_VENDOR=$host_vendor
 AC_SUBST(MAGICK_TARGET_VENDOR)
 AC_DEFINE_UNQUOTED(MAGICK_TARGET_VENDOR,$MAGICK_TARGET_VENDOR,[Target Host Vendor])