1 files changed, 21 insertions, 5 deletions

diff --git a/scripts/oe-buildenv-internal b/scripts/oe-buildenv-internal
index 85f82f1b31..354501ed4b 100755
--- a/scripts/oe-buildenv-internal
+++ b/scripts/oe-buildenv-internal
@@ -108,13 +108,29 @@ unset BITBAKEDIR newpath
 export BUILDDIR
 export PATH
 
-BB_ENV_EXTRAWHITE_OE="MACHINE DISTRO TCMODE TCLIBC HTTP_PROXY http_proxy \
+add_extrawhite() {
+    # If the current shell is zsh, then temporarily set it to emulate sh in this
+    # function so that the for and case statements below work as expected.
+    [ -z "$ZSH_NAME" ] || emulate -L sh
+
+    local extrawhite="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"
 
-echo "$BB_ENV_EXTRAWHITE" | grep -q "${BB_ENV_EXTRAWHITE_OE}"
-if [ $? != 0 ]; then
-     export BB_ENV_EXTRAWHITE="${BB_ENV_EXTRAWHITE_OE} $BB_ENV_EXTRAWHITE"
-fi
+    local var
+    for var in $extrawhite; do
+        case " $BB_ENV_EXTRAWHITE " in
+            *[[:blank:]]$var[[:blank:]]*)
+                ;;
+            *)
+                BB_ENV_EXTRAWHITE="${BB_ENV_EXTRAWHITE:+$BB_ENV_EXTRAWHITE }$var"
+                ;;
+        esac
+    done
+}
+
+add_extrawhite
+unset -f add_extrawhite
+export BB_ENV_EXTRAWHITE