Strange: Qt 3.3.8 gives "/usr/bin/ld: cannot find -lqt-mt" but library is there

dedec0 · 12-16-2015, 11:21 AM

I am trying to install and use Qt 3.3.8 (this version is need, so please don't say to use more recent versions).

Steps I have done:

1. get qt-x11-free-3.3.8.tar.bz2 from http://download.qt.io/archive/qt/3/

2. extract it to /media/PART/path/qt (any folder that is not the suggested /usr/local). I need to do this because I need to have QT installed in a different partition. Should not change anything, I guess. But assume the folder /media/PART/path/qt as the folder where QT is extracted.

3. Configure the environment variable that QT needs to work correctly. File INSTALL gives instructions to follow. We just add the some paths to include QT folders: QTDIR, PATH, MANPATH, LD_LIBRARY_PATH. I have set them in my .bashrc. After opening a new shell I have:

Code:

# echo $PATH; echo $LD_LIBRARY_PATH ; echo $QTDIR ; echo $MANPATH 
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/media/PART/path/qt/bin
/media/PART/path/qt/lib
/media/PART/path/qt
/media/PART/path/qt/doc/man

4. I have tried two sets of arguments to configure it. The final error does not change.
4.1. ./configure -qt-gif -shared -thread
4.2. ./configure -qt-gif -static -thread

5. The configure should end without errors. Now we will try to build an example that QT includes:

cd /media/PART/path/qt/examples/aclock
make

It stops with an error:

Code:

$ make
g++ -c -pipe -Wall -W -O2 -D_REENTRANT  -DQT_NO_DEBUG -DQT_THREAD_SUPPORT \
-I/media/PART/path/qt/mkspecs/linux-g++ -I. \
-I../../include -I.moc/release-static-mt/ -o .obj/release-static-mt/aclock.o \
aclock.cpp

g++ -c -pipe -Wall -W -O2 -D_REENTRANT  -DQT_NO_DEBUG -DQT_THREAD_SUPPORT \
-I/media/PART/path/qt/mkspecs/linux-g++ -I. -I../../include \
-I.moc/release-static-mt/ -o .obj/release-static-mt/main.o main.cpp

/media/PART/path/qt/bin/moc aclock.h -o .moc/release-static-mt/moc_aclock.cpp

g++ -c -pipe -Wall -W -O2 -D_REENTRANT  -DQT_NO_DEBUG -DQT_THREAD_SUPPORT \
-I/media/PART/path/qt/mkspecs/linux-g++ -I. \
-I../../include -I.moc/release-static-mt/ -o \
.obj/release-static-mt/moc_aclock.o .moc/release-static-mt/moc_aclock.cpp

g++ -Wl,-rpath,/media/PART/path/qt/lib -o aclock \
.obj/release-static-mt/aclock.o .obj/release-static-mt/main.o \
.obj/release-static-mt/moc_aclock.o   -L/media/PART/path/qt/lib \
-L/usr/X11R6/lib -lqt-mt -L/usr/X11R6/lib -lXext -lX11 -lm -ldl -lpthread

/usr/bin/ld: cannot find -lqt-mt

collect2: ld returned 1 exit status

make: ** [aclock] Error 1

$ ls /media/PART/path/qt/lib
libdesignercore.prl      libqnp.prl    libqui.prl
libeditor.prl            libqt-mt.la   qt-mt.pc
libqassistantclient.prl  libqt-mt.prl  README

$ echo $LD_LIBRARY_PATH 

/media/PART/path/qt/lib

Isn't this strange? What am I missing here?

dedec0 · 12-16-2015, 11:39 AM

I did not 'make' QT... oh, let it be. Make is running now.

dedec0 · 12-16-2015, 12:42 PM

Error:

Code:

/usr/bin/ld: cannot find -lXext
collect2: ld returned 1 exit status
make[4]: ** [../../../bin/uic] Error 1

Needed to install libxext-dev (2:1.0.99.1) and x11proto-xext-dev (7.0.4-1). Now it continues...

dedec0 · 12-16-2015, 02:09 PM

It ended. No more libraries or packages were needed. Except the awful (IMHO) detail that all examples and the tutorial are compiled by default (and I had to wait for them to compile, just to find out that I did not want to wait for them... LOL), it ended well.

My not even close to updated Ubuntu can install Qt 3.3.8 with just two packages it didn't have. Fairly easy.