error while run apps

[liamlangli]

error while loading shared libraries: libsocket.so: cannot open shared object file: No such file or directory

i got this while run compiled example.
i'm sure libsocket.so was located at /usr/lib
this is my compile command.
gcc -Wall -g -std=gnu99 -L/usr/lib -lsocket http.c -o app
my system is centos 7,

[viocycling]

I have same problem while loading shared libraries, but after I excute sudo ldconfig everything goes well. You can have a try.