Strange behavior when building kdelibs 3.5.13

I am running a full pass of my build scripts to ensure they function as expected. This time kdelibs failed to build. Looking at the build log revealed the same strange error I saw when initially trying to build kdevelop about not finding tqt.h. With kdevelop I was instructed to run an on-the-fly patch of the CMakeLists.txt files in the package to change TQT_INCLUDE_DIRS to TQT_INCLUDEDIR. I created the same type of patch for kdelibs and kdelibs then built without error. Why did this suddenly happen when during my first run at building packages I never had any such error with kdelibs? Does this kdelibs patch make sense? If so, why? Thanks. Darrell