Hi: Thanks for your reply...
I think the problem is that it can't find the library libksdk_platform_freertos.a, because the first complete error is:
make: *** No rule to make target `/home/pablo/Documentos/Documentacion/Freescale/KSDK_1.2.0/examples/frdmk64f/demo_apps/lwip/lwip_ping_demo/ping_rtos/ping_freertos/kds/../../../../../../../../lib/ksdk_freertos_lib/kds/K64F12/release/libksdk_platform_freertos.a', needed by `lwip_ping_demo_freertos_frdmk64f.elf'.
How can i solve this? if i compile in debug mode no problem is found, but in release mode this problem appears
thanks