Why doesn't the program work outside of Qt Creator?

Question

linux

For the program to work, two external libraries are needed, which I added via gui like this:

unix:!macx: LIBS += -L$$PWD/curl/ -lcurl

INCLUDEPATH += $$PWD/curl
DEPENDPATH += $$PWD/curl

unix:!macx: PRE_TARGETDEPS += $$PWD/curl/libcurl.a

unix:!macx: LIBS += -L$$PWD/jansson/ -ljansson

INCLUDEPATH += $$PWD/jansson
DEPENDPATH += $$PWD/jansson

The program builds fine and runs through the IDE, but if I go to the folder with the executable file, I get:

$ ./myapp
./myapp: error while loading shared libraries: libjansson.so.4: cannot open shared object file: No such file or directory

Answer 1

I see several ways to resolve dependencies.
First, you can build libcurl and libjansson statically and link to your application.
Secondly, in addition to static libcurl and libjansson, Qt itself can also be compiled into static and linked to your application. As a result, you will get a large executable file (the size can be trimmed with the upx utility ), which will run in all modern GNU/Linux distributions that have X's.
Thirdly, the most rational way is to build a DEB or RPM package, in which, as dependencies, add the packages libcurl3(4), libjansson4, and the necessary modules with qt4(5).
Well, running the binary itself is simple. You have an environment variable in Qt Creator LD_LIBRARY_PATH. Just copy its value to the terminal before running the program:
Curl seems to be built statically. Try to build jansson into static too. Then you will not receive errors error while loading shared libraries: libjansson.so.4: cannot open shared object file: No such file or directory .

Answer 2

It is likely that the library folders you are using are not in the shared library search paths.
If you are using linux, then you can try to run your program by first adding the paths to the corresponding folders to the LD_LIBRARY_PATH environment variable.