the mangling of 'va_list' has changed in GCC 4.4

I’m working with Wi-iMX53 embedded linux, I have been following the steps of the manuals to build an application. At the moment I’m making a simple QT embedded application using QTDesigner. I’m using Digi Esp_DigiEL_5.9, when I debugging show the next error message: the mangling of ‘va_list’ has changed in GCC 4.4.
I read on internet that adding Wno-psabi can working, but I dont know how do It.

are you building command line or via digi ESP?
just add -Wno-psabi option to the build flags in project properties screen

I’m building via digi ESP. I could fix the problem, simply adding -Wno-psabi to the CXXFLAGS.
Thanks for reply