diff --git a/yocto-poky/scripts/oe-buildenv-internal b/yocto-poky/scripts/oe-buildenv-internal
index 9ed2721..e04db03 100755
--- a/yocto-poky/scripts/oe-buildenv-internal
+++ b/yocto-poky/scripts/oe-buildenv-internal
@@ -24,7 +24,7 @@
     return 1
 fi
 
-if [ -z "$OE_SKIP_SDK_CHECK" -a ! -z "$OECORE_SDK_VERSION" ]; then
+if [ -z "$OE_SKIP_SDK_CHECK" ] && [ -n "$OECORE_SDK_VERSION" ]; then
     echo >&2 "Error: The OE SDK/ADT was detected as already being present in this shell environment. Please use a clean shell when sourcing this environment script."
     return 1
 fi
@@ -33,24 +33,26 @@
 # sanity.bbclass because bitbake's source code doesn't even pass
 # parsing stage when used with python v3, so we catch it here so we
 # can offer a meaningful error message.
-py_v3_check=`/usr/bin/env python --version 2>&1 | grep "Python 3"`
-if [ "$py_v3_check" != "" ]; then
-	echo >&2 "Bitbake is not compatible with python v3"
-	echo >&2 "Please set up python v2 as your default python interpreter"
-	return 1
+py_v3_check=$(/usr/bin/env python --version 2>&1 | grep "Python 3")
+if [ -n "$py_v3_check" ]; then
+    echo >&2 "Bitbake is not compatible with python v3"
+    echo >&2 "Please set up python v2 as your default python interpreter"
+    return 1
 fi
+unset py_v3_check
 
 # Similarly, we now have code that doesn't parse correctly with older
 # versions of Python, and rather than fixing that and being eternally
 # vigilant for any other new feature use, just check the version here.
-py_v26_check=`python -c 'import sys; print sys.version_info >= (2,7,3)'`
+py_v26_check=$(python -c 'import sys; print sys.version_info >= (2,7,3)')
 if [ "$py_v26_check" != "True" ]; then
-	echo >&2 "BitBake requires Python 2.7.3 or later"
-	return 1
+    echo >&2 "BitBake requires Python 2.7.3 or later"
+    return 1
 fi
+unset py_v26_check
 
-if [ "x$BDIR" = "x" ]; then
-    if [ "x$1" = "x" ]; then
+if [ -z "$BDIR" ]; then
+    if [ -z "$1" ]; then
         BDIR="build"
     else
         BDIR="$1"
@@ -62,48 +64,58 @@
         # Remove any possible trailing slashes. This is used to work around
         # buggy readlink in Ubuntu 10.04 that doesn't ignore trailing slashes
         # and hence "readlink -f new_dir_to_be_created/" returns empty.
-        BDIR=`echo $BDIR | sed -re 's|/+$||'`
+        BDIR=$(echo $BDIR | sed -re 's|/+$||')
 
-        BDIR=`readlink -f "$BDIR"`
+        BDIR=$(readlink -f "$BDIR")
         if [ -z "$BDIR" ]; then
-            PARENTDIR=`dirname "$1"`
+            PARENTDIR=$(dirname "$1")
             echo >&2 "Error: the directory $PARENTDIR does not exist?"
             return 1
         fi
     fi
-    if [ "x$2" != "x" ]; then
+    if [ -n "$2" ]; then
         BITBAKEDIR="$2"
     fi
 fi
-if expr "$BDIR" : '/.*' > /dev/null ; then
+if [ "${BDIR#/}" != "$BDIR" ]; then
     BUILDDIR="$BDIR"
 else
-    BUILDDIR="`pwd`/$BDIR"
+    BUILDDIR="$(pwd)/$BDIR"
 fi
 unset BDIR
 
-if [ "x$BITBAKEDIR" = "x" ]; then
-    BITBAKEDIR="$OEROOT/bitbake$BBEXTRA/"
+if [ -z "$BITBAKEDIR" ]; then
+    BITBAKEDIR="$OEROOT/bitbake$BBEXTRA"
 fi
 
-BITBAKEDIR=`readlink -f "$BITBAKEDIR"`
-BUILDDIR=`readlink -f "$BUILDDIR"`
+BITBAKEDIR=$(readlink -f "$BITBAKEDIR")
+BUILDDIR=$(readlink -f "$BUILDDIR")
 
-if ! (test -d "$BITBAKEDIR"); then
+if [ ! -d "$BITBAKEDIR" ]; then
     echo >&2 "Error: The bitbake directory ($BITBAKEDIR) does not exist!  Please ensure a copy of bitbake exists at this location"
     return 1
 fi
 
 # Make sure our paths are at the beginning of $PATH
-NEWPATHS="${OEROOT}/scripts:$BITBAKEDIR/bin:"
-PATH=$NEWPATHS$(echo $PATH | sed -e "s|:$NEWPATHS|:|g" -e "s|^$NEWPATHS||")
-unset BITBAKEDIR NEWPATHS
+for newpath in "$BITBAKEDIR/bin" "$OEROOT/scripts"; do
+    # Remove any existences of $newpath from $PATH
+    PATH=$(echo $PATH | sed -re "s#(^|:)$newpath(:|$)#\2#g;s#^:##")
+
+    # Add $newpath to $PATH
+    PATH="$newpath:$PATH"
+done
+unset BITBAKEDIR newpath
 
 # Used by the runqemu script
 export BUILDDIR
 export PATH
-export BB_ENV_EXTRAWHITE="MACHINE DISTRO TCMODE TCLIBC HTTP_PROXY http_proxy \
+
+BB_ENV_EXTRAWHITE_OE="MACHINE DISTRO TCMODE TCLIBC HTTP_PROXY http_proxy \
 HTTPS_PROXY https_proxy FTP_PROXY ftp_proxy FTPS_PROXY ftps_proxy ALL_PROXY \
 all_proxy NO_PROXY no_proxy SSH_AGENT_PID SSH_AUTH_SOCK BB_SRCREV_POLICY \
 SDKMACHINE BB_NUMBER_THREADS BB_NO_NETWORK PARALLEL_MAKE GIT_PROXY_COMMAND \
 SOCKS5_PASSWD SOCKS5_USER SCREENDIR STAMPS_DIR"
+
+BB_ENV_EXTRAWHITE="$(echo $BB_ENV_EXTRAWHITE $BB_ENV_EXTRAWHITE_OE | tr ' ' '\n' | LC_ALL=C sort --unique | tr '\n' ' ')"
+
+export BB_ENV_EXTRAWHITE