When you installed jhead where did you install it to.
If you dont run your own server and do not have access to root it definately will not be in /usr/bin as you would not have access to that.
The only people who have access to the root system are dedicated server people and people who run a VDS system on a shared system( Virtual Dedicated Server).
I do not give too much credit to precompiled binaries. The time accepted method to ensure software is truly compiled on a server is to drop source files and configure and build it with the GCC compiler.