[Octave-bug-tracker] [bug #37101] GUI build fails on Fedora or RHEL with qt3-devel installed

[Mike Miller]

Update of bug #37101 (project octave):

                 Summary: GUI build fails on FC 17 x86_64 => GUI build fails
on Fedora or RHEL with qt3-devel installed

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Follow-up Comment #2:

The problem was the presence of qmake from Qt version 3 in the PATH, which
configure found and used before qmake-qt4.

Fedora and RHEL systems install Qt4 qmake as /usr/bin/qmake-qt4. Qt3 can be
co-installed, and its qmake executable is just qmake.

For now,


yum erase qt3-devel


is a workaround for this problem.

Validating the output of qmake should be enough to tell it's a version we can
work with, here are some examples on a Fedora 17 64-bit:


address@hidden ~]$ qmake-qt4 -query QT_INSTALL_HEADERS
/usr/include
address@hidden ~]$ qmake -query QT_INSTALL_HEADERS
**Unknown**
address@hidden ~]$ qmake-qt4 -query QT_INSTALL_LIBS
/usr/lib64
address@hidden ~]$ qmake -query QT_INSTALL_LIBS
**Unknown**


If no valid paths are found from qmake, configure should keep searching for
qmake candidates in PATH.

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