Debugging an install

I was trying to install a program and couldn't work out what was going wrong. It looked like it compiled okay but when I tried to run it the linked shared objects weren't there.

./exa_c: error while loading shared libraries: libdislin.so.9: cannot open shared object file: No such file or directory

So, in order to find out what was happening I had to run the following to check out the compiled program.

ldd exa_c
        libdislin.so.9 => not found
        libm.so.6 => /lib64/libm.so.6 (0x00002ba378eeb000)
        libc.so.6 => /lib64/libc.so.6 (0x00002ba379141000)
        /lib64/ld-linux-x86-64.so.2 (0x00002ba378ccd000)

This tells me that although the program compiled okay there the first library isn't found in the LD_LIBRARY_PATH. Now I had set this variable in my own bash profile, but not in apache's. So when I ran this program in a server through cgi the fucking thing didn't work. Adding the right environment to /etc/profile enabled everyone access to the correct path for the library. Success.