Libusb and how to its package

[sh4rif]

Hello everyone

I have a very important question...
I have installed libusb by using the following command i am not sure if it was right or not and the command was

sudo apt-get install libusb-dev

once I have installed (and I am not sure if it has installed or not), I want to know how would I use the library because I write some sample code which uses <libusb.h > but when i compile that c++ file using "g++ test_libusb.cpp" that throws the following error,

"test_libusb.cpp:2:20: fatal error: libusb.h: No such file or directory
compilation terminated."

I am clueless what to do cant find any source on the internet to get to the bottom of this... can anyone please help I am a desperate.. and please treat me as novice on both c/c++ and Ubuntu...

thanks a lot for you time folks

hoping for an early response...

thanks one more time
Sharif