Do not export the wrapInstall function when porg style is not in use

common/libs/func_wrt_Makefile

@@ -45,6 +45,7 @@ ADD_REPORT       = $REPORT
 ADD_CUSTOM_TOOLS = $CUSTOM_TOOLS
 ADD_BLFS_TOOLS   = $BLFS_TOOL
 PKGMNGT          = $PKGMNGT
+WRAP_INSTALL     = $WRAP_INSTALL
 
 
 export PATH := \${PATH}:/usr/sbin

common/makefile-functions

@@ -115,7 +115,9 @@ define get_pkg_root2
     echo "export PKG_DEST=$(SRC)/$@" >> envars; \
     echo "source packInstall.sh" >> envars; \
     echo "export -f packInstall" >> envars; \
-    echo "export -f wrapInstall" >> envars; \
+    if [ "$(WRAP_INSTALL)" = "y" ]; then \
+      echo "export -f wrapInstall" >> envars; \
+    fi; \
   fi;
 endef