Overriding recipe for target (qmake)

[gbonnema]

Edit: I replaced the entire query, because I was not getting answers, so the question was not clearly formulated. I hope the next formulation elicites more responses.

My .pro file seems to generate multiple times the same install targets. Below I show the relevant part of a .pro file that has all the information. Could anyone point me in the direction what could possibly cause this?

@unix|win32 {
target.path = $$PWD/../../../lib/datamodel
INSTALLS += target

headerfiles.path=$$PWD/../../../include/datamodel
headerfiles.files = $$PWD/*.h
INSTALLS += headerfiles

}
@

And the output:

@Makefile:458: warning: overriding recipe for target 'install_target'
Makefile:449: warning: ignoring old recipe for target 'install_target'
Makefile:462: warning: overriding recipe for target 'uninstall_target'
Makefile:453: warning: ignoring old recipe for target 'uninstall_target'
Makefile:458: warning: overriding recipe for target 'install_target'
Makefile:449: warning: ignoring old recipe for target 'install_target'
Makefile:462: warning: overriding recipe for target 'uninstall_target'
Makefile:453: warning: ignoring old recipe for target 'uninstall_target'@

I checked the Makefile and indeed it generates the same entries multiple times.

Ideas? Anyone?