I've installed Eclipse CDT and GNU MCU Eclipse plugin and finaly GNU Tools for ARM.
I have set the proper paths to arm-none-eabi-gdb.
I have signed the arm-none-eabi-gdb (with the same certificate that I used to sign GDB installed via brew the day before - and it worked).
I have also tried running Eclipse as root from command line.
The message is "Configuring GDB Aborting configuring GDB".
What to do?