J Leslie Turriff via tde-users wrote:
> 	I'm trying to get a handle on writing an app for Trinity, starting with stuff
> from the Wiki; but it's a struggle.
> 	I Followed
> 		Support =>
> 			Wiki =>
> 				Developers =>
> 					Tutorials and Documentation for QT and TQT
> and hiding under the QT3 API Documentation link (which really points to
> 						TQt Reference Documentation (Open Source Edition)
> I found the Getting Started section.  Following How To Learn TQt showed me C++
> GUI Programming with TQt 3 (which I have ordered); many of the other links on
> this page point to a now-deceased TrollTech website. :-(
> 	I moved on to Tutorial #1, and after figuring out that references to "qmake"
> should really be to "tqmake", I tried compiling the fourteen example
> programs.
> 	They all fail with the same error. Example #1 is typical:
>
> |	$ make
> |
> g++ -c -O2 -g -m64 -fmessage-length=0 -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -pipe -fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -O2  -DQT_NO_DEBUG -I/usr/share/tqt3/mkspecs/default -I. -I. -I/usr/include -I/usr/include/tqt3 -o
> main.o main.cpp
> |	g++ -luuid -o hello
> main.o    -L/usr/lib64 -L/usr/lib64 -L/usr/X11R6/lib64 -luuid -ltqt -lXext -lX11 -lm
> |	/usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld:
> main.o: undefined reference to
> symbol '_ZN13TQApplication13setMainWidgetEP8TQWidget'
> |	/usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: /usr/lib64/libtqt-mt.so.3:
> error adding symbols: DSO missing from command line
> |	collect2: error: ld returned 1 exit status
> |	make: *** [Makefile:88: hello] Error 1
>
> in which the loader seems to be complaining about setMainWidget, a method of
> TQApplication.  It seems to be expecting to find it in
> |	/usr/lib64/libtqt-mt.so.3
> and I see on the web that adding
> |	-ltqt-mt
> will fix the problem, and several web responses say to use
> |	./configure LIBS=-ltqt-mt
> but how would I do that with tqmake?
>
> Leslie
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I just tried the t1 example in the tutorial folder from the tqt3 source 
in the console:

g++ main.cpp -I/usr/include/tqt -I/usr/include/tqt3 -ltqt-mt -o t1
./t1


(my) corresponding t1.pro file:

TEMPLATE������� = app
CONFIG��� ������ += qt warn_on release
HEADERS��� ����� =
SOURCES��� ����� = main.cpp
TARGET��� ������� = t1
INCLUDEPATH = /usr/include/tqt3 /usr/include/tqt

tqmake -o Makefile t1.pro
make
./t1

regarding the book i like "Programming with Qt" 2nd edition (the second 
edition includes qt3) from O'Reilly by Matthias Kalle Dalheimer

Cheers.
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