diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 42b9825..e51df7a 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -94,7 +94,8 @@ BASE_PACKAGE_ARCH = "${HOST_ARCH}"
 PACKAGE_ARCH = "${BASE_PACKAGE_ARCH}"
 MACHINE_ARCH = "${@[bb.data.getVar('BASE_PACKAGE_ARCH', d, 1), bb.data.getVar('MACHINE', d, 1)][bool(bb.data.getVar('MACHINE', d, 1))]}"
 MACHINE_ARCH_qemux86-64 = "qemux86_64"
-PACKAGE_ARCHS = "all any noarch ${TARGET_ARCH} ${PACKAGE_EXTRA_ARCHS} ${MACHINE_ARCH}"
+PACKAGE_EXTRA_ARCHS ??= "${TARGET_ARCH}"
+PACKAGE_ARCHS = "all any noarch ${PACKAGE_EXTRA_ARCHS} ${MACHINE_ARCH}"
 # MACHINE shouldn't be included here as a variable dependency since machine specific 
 # packages are handled using multimachine
 PACKAGE_ARCHS[vardepsexclude] = "MACHINE"
diff --git a/meta/conf/machine/include/tune-arm1136jf-s.inc b/meta/conf/machine/include/tune-arm1136jf-s.inc
index a771751..2ea3c9d 100644
--- a/meta/conf/machine/include/tune-arm1136jf-s.inc
+++ b/meta/conf/machine/include/tune-arm1136jf-s.inc
@@ -4,6 +4,6 @@ FEED_ARCH = "armv6"
 BASE_PACKAGE_ARCH = "armv6"
 
 ARM_INSTRUCTION_SET = "${@['thumb','arm'][bb.data.getVar('CPU_FEATURES', d, 1).find('thumb') == -1]}"
-PACKAGE_EXTRA_ARCHS += "armv4 armv4t armv5te armv6"
+PACKAGE_EXTRA_ARCHS = "arm armv4 armv4t armv5te armv6"
 
 require conf/machine/include/tune-thumb.inc
diff --git a/meta/conf/machine/include/tune-arm920t.inc b/meta/conf/machine/include/tune-arm920t.inc
index fee5c58..564b557 100644
--- a/meta/conf/machine/include/tune-arm920t.inc
+++ b/meta/conf/machine/include/tune-arm920t.inc
@@ -1,4 +1,4 @@
 FEED_ARCH = "armv4t"
 BASE_PACKAGE_ARCH = "armv4t" 
 TARGET_CC_ARCH = "-march=armv4t -mtune=arm920t"
-PACKAGE_EXTRA_ARCHS += "armv4 armv4t"
+PACKAGE_EXTRA_ARCHS = "arm armv4 armv4t"
diff --git a/meta/conf/machine/include/tune-arm926ejs.inc b/meta/conf/machine/include/tune-arm926ejs.inc
index f41e460..9d546c9 100644
--- a/meta/conf/machine/include/tune-arm926ejs.inc
+++ b/meta/conf/machine/include/tune-arm926ejs.inc
@@ -1,5 +1,5 @@
 FEED_ARCH = "armv5te"
-PACKAGE_EXTRA_ARCHS += "armv4 armv4t armv5te"
+PACKAGE_EXTRA_ARCHS = "arm armv4 armv4t armv5te"
 # For gcc 3.x you need:
 #TARGET_CC_ARCH = "-march=armv5te -mtune=arm926ejs"
 # For gcc 4.x you need:
diff --git a/meta/conf/machine/include/tune-arm9tdmi.inc b/meta/conf/machine/include/tune-arm9tdmi.inc
index d788b53..5446ce8 100644
--- a/meta/conf/machine/include/tune-arm9tdmi.inc
+++ b/meta/conf/machine/include/tune-arm9tdmi.inc
@@ -1,4 +1,4 @@
 FEED_ARCH = "armv4t"
 BASE_PACKAGE_ARCH = "armv4t"
-PACKAGE_EXTRA_ARCHS += "armv4 armv4t"
+PACKAGE_EXTRA_ARCHS = "arm armv4 armv4t"
 TARGET_CC_ARCH = "-mcpu=arm9tdmi -mtune=arm9tdmi"
diff --git a/meta/conf/machine/include/tune-armv7.inc b/meta/conf/machine/include/tune-armv7.inc
index 379a3eb..979d6fe 100644
--- a/meta/conf/machine/include/tune-armv7.inc
+++ b/meta/conf/machine/include/tune-armv7.inc
@@ -3,5 +3,5 @@
 # This will NOT compile programs in 'ARM' mode, which is what you really want
 TARGET_CC_ARCH = "-march=armv7 -mfpu=vfp -mfloat-abi=softfp"
 FEED_ARCH = "armv7"
-PACKAGE_EXTRA_ARCHS += "armv4 armv4t armv5te armv6 armv7"
+PACKAGE_EXTRA_ARCHS = "arm armv4 armv4t armv5te armv6 armv7"
 BASE_PACKAGE_ARCH = "armv7"
diff --git a/meta/conf/machine/include/tune-atom.inc b/meta/conf/machine/include/tune-atom.inc
index 66d960a..399ea54 100644
--- a/meta/conf/machine/include/tune-atom.inc
+++ b/meta/conf/machine/include/tune-atom.inc
@@ -2,4 +2,4 @@ BASE_PACKAGE_ARCH = "core2"
 TARGET_CC_ARCH = "-m32 -march=core2 -msse3 -mtune=generic -mfpmath=sse"
 #MOBLIN_CFLAGS = "-Os -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -fasynchronous-unwind-tables"
 
-PACKAGE_EXTRA_ARCHS += "x86 i386 i486 core2"
+PACKAGE_EXTRA_ARCHS = "x86 i386 i486 i586 i686 core2"
diff --git a/meta/conf/machine/include/tune-c3.inc b/meta/conf/machine/include/tune-c3.inc
index 1d636e8..d33df5f 100644
--- a/meta/conf/machine/include/tune-c3.inc
+++ b/meta/conf/machine/include/tune-c3.inc
@@ -1,4 +1,4 @@
 TARGET_CC_ARCH = "-march=c3 -mtune=c3"
-PACKAGE_EXTRA_ARCHS += "i386 i486 i586"
+PACKAGE_EXTRA_ARCHS = "i386 i486 i586"
 BASE_PACKAGE_ARCH = "i586"
 FEED_ARCH = "i586"
diff --git a/meta/conf/machine/include/tune-cortexa8.inc b/meta/conf/machine/include/tune-cortexa8.inc
index 3ec1c03..a5b982a 100644
--- a/meta/conf/machine/include/tune-cortexa8.inc
+++ b/meta/conf/machine/include/tune-cortexa8.inc
@@ -10,4 +10,4 @@ TARGET_CC_ARCH = "-march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp
 
 FEED_ARCH = "armv7a"
 BASE_PACKAGE_ARCH = "armv7a"
-PACKAGE_EXTRA_ARCHS += "armv4 armv4t armv5te armv6 armv7 armv7a"
+PACKAGE_EXTRA_ARCHS = "arm armv4 armv4t armv5te armv6 armv7 armv7a"
diff --git a/meta/conf/machine/include/tune-ep9312.inc b/meta/conf/machine/include/tune-ep9312.inc
index d0c5bb2..e1515a0 100644
--- a/meta/conf/machine/include/tune-ep9312.inc
+++ b/meta/conf/machine/include/tune-ep9312.inc
@@ -2,7 +2,7 @@ TARGET_CC_ARCH = "-march=ep9312 -mtune=ep9312 -mcpu=ep9312"
 # add "-mfp=maverick" for newer gcc versions > 4.0
 
 #set arch to ep9312 for all generated packages
-PACKAGE_EXTRA_ARCHS += "armv4t ep9312"
+PACKAGE_EXTRA_ARCHS = "arm armv4t ep9312"
 BASE_PACKAGE_ARCH = "ep9312"
 FEED_ARCH = "ep9312"
 
diff --git a/meta/conf/machine/include/tune-iwmmxt.inc b/meta/conf/machine/include/tune-iwmmxt.inc
index f7291be..7191ab0 100644
--- a/meta/conf/machine/include/tune-iwmmxt.inc
+++ b/meta/conf/machine/include/tune-iwmmxt.inc
@@ -2,6 +2,6 @@
 # Please use tune-xscale for PXA255/PXA26x based processors.
 TARGET_CC_ARCH = "-march=iwmmxt -mcpu=iwmmxt -mtune=iwmmxt"
 BASE_PACKAGE_ARCH = "iwmmxt"
-PACKAGE_EXTRA_ARCHS += "armv4 armv4t armv5te iwmmxt"
+PACKAGE_EXTRA_ARCHS = "arm armv4 armv4t armv5te iwmmxt"
 FEED_ARCH = "iwmmxt"
 
diff --git a/meta/conf/machine/include/tune-ppc603e.inc b/meta/conf/machine/include/tune-ppc603e.inc
index 15a72d1..dc95d0d 100644
--- a/meta/conf/machine/include/tune-ppc603e.inc
+++ b/meta/conf/machine/include/tune-ppc603e.inc
@@ -1,4 +1,4 @@
 TARGET_CC_ARCH = "-mcpu=603e  -mhard-float"
 BASE_PACKAGE_ARCH = "ppc603e"
 FEED_ARCH = "ppc603e"
-PACKAGE_EXTRA_ARCHS += "ppc603e"
+PACKAGE_EXTRA_ARCHS = "powerpc ppc603e"
diff --git a/meta/conf/machine/include/tune-ppce300c2.inc b/meta/conf/machine/include/tune-ppce300c2.inc
index 2956875..3e552e6 100644
--- a/meta/conf/machine/include/tune-ppce300c2.inc
+++ b/meta/conf/machine/include/tune-ppce300c2.inc
@@ -1,3 +1,3 @@
 TARGET_CC_ARCH = "-mcpu=e300c2 -msoft-float"
 BASE_PACKAGE_ARCH = "ppce300"
-PACKAGE_EXTRA_ARCHS += "ppce300"
+PACKAGE_EXTRA_ARCHS = "powerpc ppce300"
diff --git a/meta/conf/machine/include/tune-ppce500.inc b/meta/conf/machine/include/tune-ppce500.inc
index 44f8742..45e1f0d 100644
--- a/meta/conf/machine/include/tune-ppce500.inc
+++ b/meta/conf/machine/include/tune-ppce500.inc
@@ -1,4 +1,4 @@
 TARGET_CC_ARCH = "-mcpu=8540"
 BASE_PACKAGE_ARCH = "ppce500"
 FEED_ARCH = "ppce500"
-PACKAGE_EXTRA_ARCHS += "ppce500"
+PACKAGE_EXTRA_ARCHS = "powerpc ppce500"
diff --git a/meta/conf/machine/include/tune-xscale.inc b/meta/conf/machine/include/tune-xscale.inc
index f1ef3d4..cfdcc99 100644
--- a/meta/conf/machine/include/tune-xscale.inc
+++ b/meta/conf/machine/include/tune-xscale.inc
@@ -5,7 +5,7 @@ INHERIT += "siteinfo"
 TARGET_CC_ARCH = "-march=armv5te -mtune=xscale"
 TARGET_CC_KERNEL_ARCH = "-march=armv5te -mtune=xscale"
 BASE_PACKAGE_ARCH = "${@['armv5teb', 'armv5te'][bb.data.getVar('SITEINFO_ENDIANESS', d, 1) == 'le']}"
-PACKAGE_EXTRA_ARCHS += "${@['armv4b armv4tb armv5teb', 'armv4 armv4t armv5te'][bb.data.getVar('SITEINFO_ENDIANESS', d, 1) == 'le']}"
+PACKAGE_EXTRA_ARCHS = "${@['armeb armv4b armv4tb armv5teb', 'arm armv4 armv4t armv5te'][bb.data.getVar('SITEINFO_ENDIANESS', d, 1) == 'le']}"
 
 # webkit-gtk has alignment issues with double instructions on armv5 so
 # disable them here