diff --git a/import-layers/yocto-poky/meta/files/ext-sdk-prepare.py b/import-layers/yocto-poky/meta/files/ext-sdk-prepare.py
index 78c1d16..96c5212 100644
--- a/import-layers/yocto-poky/meta/files/ext-sdk-prepare.py
+++ b/import-layers/yocto-poky/meta/files/ext-sdk-prepare.py
@@ -53,6 +53,8 @@
         logf.write('Preparing SDK for %s...\n' % ', '.join(sdk_targets))
 
         ret = run_command_interruptible('BB_SETSCENE_ENFORCE=1 bitbake --quiet %s' % ' '.join(sdk_targets))
+        if not ret:
+            ret = run_command_interruptible('bitbake --quiet build-sysroots')
         lastlog = get_last_consolelog()
         if lastlog:
             with open(lastlog, 'r') as f:
diff --git a/import-layers/yocto-poky/meta/files/fs-perms.txt b/import-layers/yocto-poky/meta/files/fs-perms.txt
index 3d00e86..c8c3ac5 100644
--- a/import-layers/yocto-poky/meta/files/fs-perms.txt
+++ b/import-layers/yocto-poky/meta/files/fs-perms.txt
@@ -63,8 +63,5 @@
 # Set 0700
 ${ROOT_HOME}			0700	root	root	false - - -
 
-# Set 755-lsb
-/srv				0755	root	root	false - - -
-
 # Set 2775-lsb
-/var/mail			02775	root	mail	false - - -
+${localstatedir}/mail		02775	root	mail	false - - -
diff --git a/import-layers/yocto-poky/meta/files/toolchain-shar-extract.sh b/import-layers/yocto-poky/meta/files/toolchain-shar-extract.sh
index 9295ddc..91804ec 100644
--- a/import-layers/yocto-poky/meta/files/toolchain-shar-extract.sh
+++ b/import-layers/yocto-poky/meta/files/toolchain-shar-extract.sh
@@ -8,9 +8,26 @@
 [ -f /etc/environment ] && . /etc/environment
 export PATH=`echo "$PATH" | sed -e 's/:\.//' -e 's/::/:/'`
 
+tweakpath () {
+    case ":${PATH}:" in
+        *:"$1":*)
+            ;;
+        *)
+            PATH=$PATH:$1
+    esac
+}
+
+# Some systems don't have /usr/sbin or /sbin in the cleaned environment PATH but we make need it 
+# for the system's host tooling checks
+tweakpath /usr/sbin
+tweakpath /sbin
+
 INST_ARCH=$(uname -m | sed -e "s/i[3-6]86/ix86/" -e "s/x86[-_]64/x86_64/")
 SDK_ARCH=$(echo @SDK_ARCH@ | sed -e "s/i[3-6]86/ix86/" -e "s/x86[-_]64/x86_64/")
 
+INST_GCC_VER=$(gcc --version | sed -ne 's/.* \([0-9]\+\.[0-9]\+\)\.[0-9]\+.*/\1/p')
+SDK_GCC_VER='@SDK_GCC_VER@'
+
 verlte () {
 	[  "$1" = "`printf "$1\n$2" | sort -V | head -n1`" ]
 }
@@ -112,6 +129,11 @@
 # SDK_EXTENSIBLE is exposed from the SDK_PRE_INSTALL_COMMAND above
 if [ "$SDK_EXTENSIBLE" = "1" ]; then
 	DEFAULT_INSTALL_DIR="@SDKEXTPATH@"
+	if [ "$INST_GCC_VER" = '4.8' -a "$SDK_GCC_VER" = '4.9' ] || [ "$INST_GCC_VER" = '4.8' -a "$SDK_GCC_VER" = '' ] || \
+		[ "$INST_GCC_VER" = '4.9' -a "$SDK_GCC_VER" = '' ]; then
+		echo "Error: Incompatible SDK installer! Your host gcc version is $INST_GCC_VER and this SDK was built by gcc higher version."
+		exit 1
+	fi
 fi
 
 if [ "$target_sdk_dir" = "" ]; then