Since migrating my source tree to a different location (but with sources, pro and pri files being identical), I get a strange error when trying to build:

During the first step, when qmake is "reading" the .pro files I get:
@error: Project: 'tmain_tp.pro', lib 'libtfrt.a' could not be found@

"tmain_tp.pro" is the single application, while "tfrt" happens to be the first library in the LIBS variable of my application's pro file.

The project "tfrt" is part of the subdirs. When I right-click and manually build "trft", the library is created and the application project no longer complains about it. It then complains about the next library in the list.

So far, when I built a subdirs project, it automatically built all the libraries first, before trying to find them in the application project. Now it seems it doesn't even try to build them.

Snip of the subdirs project file:
@CONFIG += ordered
CONFIG += debug_and_release_target
TEMPLATE = subdirs

SUBDIRS =
mls_tool
tasn
tdd

tfrt
tfr_tp
tfrf_tp
tfrw_widgetdatagui
tfrc
tim
tada

tmain_tp

SUBDIRS contains many more lib projects in reality, but they are just the same as those shown

mls_tool.file = sourcen/mls/code/mls_tool.pro
tasn.file = sourcen/tasn/code/tasn.pro
tdd.file = sourcen/tdd/code/tdd.pro

tfrt.file = sourcen/tfrt/code/tfrt.pro
tfr_tp.file = sourcen/tfr/code/tfr_tp.pro
tfrf_tp.file = sourcen/tfrf/code/tfrf_tp.pro
tfrw_widgetdatagui.file = sourcen/tfrw/code/tfrw_widgetdatagui.pro
tfrc.file = sourcen/tfrc/code/tfrc.pro
tim.file = sourcen/tim/code/tim.pro
tada.file = sourcen/tada/code/tada.pro

tmain_tp.file = sourcen/tmain/code/tmain_tp.pro
@

I have already tried:

• Manually deleting all makefiles
• Deleting Creator's .user file, and regenerating it from the original .pro file
• Clean and rebuild
• As I said, I can manually build the single libraries, but it's no fun

EDIT:
Turned out to be a self-generated error message...