The following steps help rebuild the EWL library files:
For example, if your Kinetis product layout is in the folder C:\Freescale\CW MCU v10.x\MCU\ARM_EABI_Support\ewl
You can build all the libraries at one go. To do this, right-click on the project and click on Build Configurations and click on Clean All to clean all the existing libraries. Click on Build All to build all the libraries.