To delete a build option:
Locate the build configuration containing the build option you want to delete.
Make sure the build configuration is checked out.
Select the entry containing the build option:
If the build option is attached to the build configuration, select the build configuration name. The Build Options heading should be visible in the content pane.
If the build option is attached to a specific target, select the target name. The Build Options heading should be visible in the content pane.
Place a check mark next to the option or options you want to delete.
Click the Delete icon (shaped like a red X). A confirmation dialog box asks you to confirm the deletion.
Click Yes to confirm the deletion; click Cancel to leave the build option as is.