gnucash won't start libgnc-gnome.so.0 No such file

[Ron Schnatzmeyer]

I'm making a valiant effort to get to Linux from Windows. I've set up a 
dual boot with Mint 17.2 and I'm trying to set up GnuCash to replace 
Quicken. The GnuCash version in the Mint/Ubuntu repository is 2.6.1 
which is 6 releases behind so I decided to be brave and install 2.6.7 
from source. Other than having to install a bunch of stuff that 
configure identified, everything went OK. But when I try to start the 
program by typing 'gnucash' as the command line I get:

ron at RCS1 ~ $ gnucash
gnucash: error while loading shared libraries: libgnc-gnome.so.0: cannot 
open shared object file: No such file or directory

This is very strange because 'libgnc-gnome.so.0' does exist in 
/usr/local/lib. I've tried adding /usr/local/lib to the PATH but that 
doesn't work.

I must have done something incorrectly but I have no idea what.
Any thoughts on what is the problem?