diff -r 4d365e34ac0b08d1f71ca4dbc57de8acb07c42c7 -r 0bf643a2ed034a1f8bd795eb2d11a8e5d0a0e656 configure.ac
--- a/configure.ac	Wed Apr 17 23:11:57 2013 -0500
+++ b/configure.ac	Wed Apr 17 23:13:42 2013 -0500
@@ -326,43 +326,43 @@
 
 
 dnl checking for specific cpu support
-dnl AC_SUBST([mode_386],["#"])
+AC_SUBST([mode_386],["#"])
 AC_SUBST([mode_mmx],["#"])
 AC_SUBST([mode_cmov],["#"])
 AC_SUBST([mode_sse],["#"])
 AC_SUBST([mode_sse2],["#"])
 AC_SUBST([mode_3dnow],["#"])
 AC_SUBST([mode_athlon],["#"])
-dnl AC_SUBST([mode_X86_64],["#"])
+AC_SUBST([mode_X86_64],["#"])
 AC_SUBST([ASM_DEFINES],[""])
 
-#AC_MSG_CHECKING([for specific cpu support])
-#AC_TRY_RUN([
-#int main()
-#{
-# #if #cpu (i386)
-#  return 0;
-# #else
-#  return 1;
-# #endif
-#}
-#], [AC_MSG_RESULT([i386 (32bit) is supported])]
-#   # [ASM_DEFINES=$ASM_DEFINES" -DASM_386"]
-#   [AC_SUBST([mode_386],[""])],
-#[  AC_TRY_RUN([
-#  int main()
-#  {
-#   #if #cpu (x86_64)
-#    return 0;
-#   #else
-#    return 1;
-#   #endif
-#  }
-#  ], [AC_MSG_RESULT([X86_64 (64bit) is supported])]
-#     [ASM_DEFINES=$ASM_DEFINES" -DASM_X86_64"]
-#     [AC_SUBST([mode_X86_64],[""])],
-#   [AC_MSG_RESULT([no, generic support])])
-#])
+AC_MSG_CHECKING([for specific cpu support])
+AC_TRY_RUN([
+int main()
+{
+ #if #cpu (i386)
+  return 0;
+ #else
+  return 1;
+ #endif
+}
+], [AC_MSG_RESULT([i386 (32bit) is supported])]
+   [ASM_DEFINES=$ASM_DEFINES" -DASM_386"]
+   [AC_SUBST([mode_386],[""])],
+[  AC_TRY_RUN([
+  int main()
+  {
+   #if #cpu (x86_64)
+    return 0;
+   #else
+    return 1;
+   #endif
+  }
+  ], [AC_MSG_RESULT([X86_64 (64bit) is supported])]
+     [ASM_DEFINES=$ASM_DEFINES" -DASM_X86_64"]
+     [AC_SUBST([mode_X86_64],[""])],
+   [AC_MSG_RESULT([no, generic support])])
+])
 
 if test "x$mode_386" = "x"; then
 
diff -r 4d365e34ac0b08d1f71ca4dbc57de8acb07c42c7 -r 0bf643a2ed034a1f8bd795eb2d11a8e5d0a0e656 src/Makefile.in
--- a/src/Makefile.in	Wed Apr 17 23:11:57 2013 -0500
+++ b/src/Makefile.in	Wed Apr 17 23:13:42 2013 -0500
@@ -378,7 +378,7 @@
 localstatedir = @localstatedir@
 mandir = @mandir@
 mkdir_p = @mkdir_p@
-mode_386 = @mode_386@
+#mode_386 = @mode_386@
 mode_3dnow = @mode_3dnow@
 mode_X86_64 = @mode_X86_64@
 mode_athlon = @mode_athlon@
diff -r 4d365e34ac0b08d1f71ca4dbc57de8acb07c42c7 -r 0bf643a2ed034a1f8bd795eb2d11a8e5d0a0e656 src/Sieving.cc
--- a/src/Sieving.cc	Wed Apr 17 23:11:57 2013 -0500
+++ b/src/Sieving.cc	Wed Apr 17 23:13:42 2013 -0500
@@ -615,6 +615,7 @@
 #else
 #undef SIEBASM_386
 #warning "No optimized assemblercode available for sieving with TSieveElement!"
+unsigned int clobbered_int;
 #endif
  #if !defined(asm_sieb_small)
   #warning "no optimized asm_sieb_small, therefore using asm_sieb"