Unsolved VeinApiLinux.so /usr/bin/ld: cannot find -lVeinApiLinux

[Jack_Xuan]

I am a noob of Qt and using a fingervein device for developing work.But I met a problem .I dont konw how to deal with.Here are some info,as follows:

1,BUG :

/usr/bin/ld: cannot find -lVeinApiLinux
Makefile:234: recipe for target 'mycom' failed
collect2: error: ld returned 1 exit status
make: *** [mycom] Error 1
19:20:20: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project mycom (kit: Desktop Qt 5.7.1 GCC 64bit)
When executing step "Make"
2.MYCOM.PRO INFO

VeinApiLinux .so

INCLUDEPATH += /usr/lib
LIBS += -L/usr/lib -lVeinApiLinux -ldl

I appreciate it.

[p3c0]

@Jack_Xuan Did you check if the library exists at that path ?

[Jack_Xuan]

thx,hi ,h

jack@jack:/etc$ ldd /usr/lib/VeinApiLinux
        linux-vdso.so.1 =>  (0x00007ffde9bdf000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f1caacea000)
        /lib64/ld-linux-x86-64.so.2 (0x0000563fb169f000)
jack@jack:/etc$ 

[Jack_Xuan]

@p3c0 jack@jack:/etc$ ldd /usr/lib/VeinApiLinux
linux-vdso.so.1 => (0x0000
7ffde9bdf000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f1caacea000)
/lib64/ld-linux-x86-64.so.2 (0x0000563fb169f000)
jack@jack:/etc$

[p3c0]

@Jack_Xuan If VeinApiLinux is a library then it should be prefixed with lib and end with .so for dynamic and .a for static because that is what gcc expects. Try renaming it.

[Jack_Xuan]

@p3c0 renaming VeinApiLinux.so->libfingervein.so.0.1 ? then ldconfig -v

[p3c0]

@Jack_Xuan You are compiling against the library as

LIBS += -L/usr/lib -lVeinApiLinux -ldl

so the compiler expects a library as
libVeinApiLinux.so