Include and modify some kdelibs files in a GPL project

Hi,

I have a little question about kdelibs license.

I'm developing a GPL library and wanted to use KProcess class (in
kdecore module of kdelibs). However, I don't want that my library
needs to be linked against full kdelibs (I want to keep its
dependencies at minimum). So I'm copying KProcess files to my own
library and modifying them to remove any KDE or QT dependency.

The question is, can this be done? I mean, as far as I know, I must
keep the LGPL license on those files but, should I do anything else? I
can license the library under GPL and keep specific files under LGPL
telling that they were got from kdelibs and later modified by me,
right?

Thank you for your attention.

Daniel Calviño Sánchez