diff --git a/cpukit/configure.ac b/cpukit/configure.ac
index 6346996461..bcd9c5fabd 100644
--- a/cpukit/configure.ac
+++ b/cpukit/configure.ac
@@ -328,13 +328,10 @@ score/Makefile
 score/cpu/Makefile
 score/cpu/arm/Makefile
 score/cpu/bfin/Makefile
-score/cpu/avr/Makefile
-score/cpu/c4x/Makefile
 score/cpu/h8300/Makefile
 score/cpu/i386/Makefile
 score/cpu/m68k/Makefile
 score/cpu/mips/Makefile
-score/cpu/nios2/Makefile
 score/cpu/powerpc/Makefile
 score/cpu/sh/Makefile
 score/cpu/sparc/Makefile