#298 libqwt.so excluded after make install on Linux

[Anonymous]

When building qwt 6.1.3 with QT 5.10.1 and running make install, the libqwt.so file is excluded from the lib/ directory, giving rise to a library not found error on my application'n build. This has been tested on Fedora 28 and Mint 19 (g++ 8 and 7, respectively).

Steps to reproduce:

tar xjvf qwt-6.1.3.tar.bz2
cd qwt-6.1.3
~/Qt/5.10.1/gcc_64/bin/qmake qwt.pro
make
make install

Output:

ad@ad-VB:~/qwt-6.1.3$ ll lib
total 8
drwxr-xr-x 2 ad ad 4096 Sep 2 14:53 ./
drwxr-xr-x 12 ad ad 4096 Sep 2 14:53 ../
lrwxrwxrwx 1 ad ad 15 Sep 2 14:53 libqwt.so -> libqwt.so.6.1.3
lrwxrwxrwx 1 ad ad 15 Sep 2 14:53 libqwt.so.6 -> libqwt.so.6.1.3
lrwxrwxrwx 1 ad ad 15 Sep 2 14:53 libqwt.so.6.1 -> libqwt.so.6.1.3
(The links are broken)

ad@ad-VB:~/qwt-6.1.3$ ll lib/libqwt.so.6.1.3
ls: cannot access 'lib/libqwt.so.6.1.3': No such file or directory

[Anonymous]

Here is some relevant output from 'make install'.

cd src/ && ( test -e Makefile || /home/administrator/Qt/5.10.1/gcc_64/bin/qmake -o Makefile /home/administrator/qwt-6.1.3/src/src.pro ) && make -f Makefile install
make[1]: Entering directory '/home/administrator/qwt-6.1.3/src'
rm -f libqwt.so.6.1.3 libqwt.so libqwt.so.6 libqwt.so.6.1
linking ../lib/libqwt.so.6.1.3
ln -s libqwt.so.6.1.3 libqwt.so
ln -s libqwt.so.6.1.3 libqwt.so.6
ln -s libqwt.so.6.1.3 libqwt.so.6.1
rm -f ../lib/libqwt.so.6.1.3
mv -f libqwt.so.6.1.3  ../lib/
rm -f ../lib/libqwt.so
rm -f ../lib/libqwt.so.6
rm -f ../lib/libqwt.so.6.1
mv -f libqwt.so ../lib/
mv -f libqwt.so.6 ../lib/
mv -f libqwt.so.6.1 ../lib/
/home/administrator/Qt/5.10.1/gcc_64/bin/qmake -install qinstall -exe ../lib/libqwt.so.6.1.3 /home/administrator/qwt-6.1.3/lib/libqwt.so.6.1.3
Error copying ../lib/libqwt.so.6.1.3 to /home/administrator/qwt-6.1.3/lib/libqwt.so.6.1.3: Cannot open ../lib/libqwt.so.6.1.3 for input
Makefile:14184: recipe for target 'install_target' failed

[Uwe Rathmann]

I can't confirm this issue on my box with ( here Qt 5.10.0 ).

But the obvious reason for the error seems to be, that lib/libqwt.so.6.1.3 does not exist on your box - even if the command sequence above clearly indicates that it is build right there.

Maybe you can do the following to find out what is going wrong:

cd src
qmake

Now edit the Makefile: search for "ln -s" and add some commands that give you more information to understand, what happens with your lib - like f.e adding a "ls -l ../lib/*" at the end.

make

[Pedro O S]

Thanks. I'll have a look.