diff --git a/cde/config/cf/linux.cf b/cde/config/cf/linux.cf
index c48196a8c..ec691d4a1 100644
--- a/cde/config/cf/linux.cf
+++ b/cde/config/cf/linux.cf
@@ -159,6 +159,11 @@ XCOMM binutils:  (LinuxBinUtilsMajorVersion)
 #endif
 #endif /* AMD64Architecture */
 
+#ifdef PpcArchitecture
+#define OptimizedCDebugFlags    -O2
+#define LinuxMachineDefines     -D__powerpc__
+#endif /* PpcArchitecture */
+
 #ifdef AlphaArchitecture
 #define OptimizedCDebugFlags	-O2
 #define LinuxMachineDefines	-D__alpha__
diff --git a/cde/config/imake/imakemdep.h b/cde/config/imake/imakemdep.h
index 08316136b..2ec32e27b 100644
--- a/cde/config/imake/imakemdep.h
+++ b/cde/config/imake/imakemdep.h
@@ -325,10 +325,24 @@ char *cpp_argv[ARGUMENTS] = {
 # ifdef __x86_64__
         "-D__amd64__",
 # endif
+# ifdef __ppc__
+        {"-D__powerpc__", "1"},
+# endif
+# ifdef __ppc64__
+        {"-D__powerpc64__", "1"},
+# endif
+# ifdef __powerpc__
+        {"-D__powerpc__", "1"},
+# endif
+# ifdef __powerpc64__
+        {"-D__powerpc64__", "1"},
+# endif
+
 # ifdef __GNUC__
 	"-traditional",
 # endif
 #endif
+
 #ifdef M4330
 	"-DM4330",	/* Tektronix */
 #endif