I downloaded and extracted amplide-demo-linux64.tar.gz to /opt/amplide/.
Then I downloaded lp_solve_5.5.2.0_exe_ux32.tar.gz and extracted file lpsolve to /opt/amplide/ampl/.
And I have liblpsolve55.so under directory suggested on AMPL page:
kjrz@kjrz-tsh ~ $ ll /usr/lib/lp_solve/
total 604
drwxr-xr-x 2 root root 4096 Jun 24 2014 .
drwxr-xr-x 185 root root 20480 Jan 14 11:11 ..
-rw-r--r-- 1 root root 590168 Dec 23 2013 liblpsolve55.so
This is what happens:
ampl: option solver lpsolve;
ampl: model owd.mod;
ampl: data owd.dat;
ampl: solve;
lpsolve: error while loading shared libraries: liblpsolve55.so: cannot open shared object file: No such file or directory
exit code 127
<BREAK>
How is that?
You should put (a link to) the liblpsolve55.so somewhere on the library search paths, for example /usr/lib:
$ sudo ln -s /usr/lib/lp_solve/liblpsolve55.so /usr/lib
Also make sure that you have 32-bit (x86) version of liblpsolve55.so installed. For example, on 64-bit Ubuntu you can install 32-bit version of liblpsolve55.so as follows:
$ sudo apt-get install lp-solve:i386