How can I compile the Mongodb-c-driver program?
The path /usr/local/lib should be in /etc/ld.so.conf or in one of the files in /etc/ld.so.conf.d/ directory. So the library mongoc will get into the cache when you issue command ldconfig as root.
You can check if library mongoc is in dynamic linker cache by executing this command
ldconfig -p | grep mongocIf it is you are safe to run your program without explicitly specifying LD_LIBRARY_PATH.
Other way to check if your executable is correctly linked is by getting the linking information with ldd command. It will print all linked libraries.
ldd mongotestIf you can see /usr/local/lib/libmongoc.so.[numbers] that means it is linked with mongoc library.