Merge pull request #5112 from sylvestre/selinux-no-mac

only set SELINUX_ENABLED=1 on Linux

util/build-gnu.sh

@@ -43,7 +43,14 @@ UU_BUILD_DIR="${path_UUTILS}/target/${UU_MAKE_PROFILE}"
 echo "UU_BUILD_DIR='${UU_BUILD_DIR}'"
 
 cd "${path_UUTILS}" && echo "[ pwd:'${PWD}' ]"
-SELINUX_ENABLED=1 make PROFILE="${UU_MAKE_PROFILE}"
+
+if [ "$(uname)" == "Linux" ]; then
+# only set on linux
+    export SELINUX_ENABLED=1
+fi
+
+make PROFILE="${UU_MAKE_PROFILE}"
+
 cp "${UU_BUILD_DIR}/install" "${UU_BUILD_DIR}/ginstall" # The GNU tests rename this script before running, to avoid confusion with the make target
 # Create *sum binaries
 for sum in b2sum b3sum md5sum sha1sum sha224sum sha256sum sha384sum sha512sum; do