UnixODBC DB2 setup

Hello,

I have installed unixODBC.x86_64 on a Linux box and I'm currently having difficulty using isql to connect to DB2.

My odbcinst.ini is as follows:
# Driver for the DB2 package
[DB2]
Description = DB2 driver for Linux
Driver = /home/db2clnt8/sqllib/lib64/libdb2.so
FileUsage = 1
DontDLClose = 1

My odbc.ini is as follows:
[sample]
Description = Test to DB2
Driver = DB2

I have setup my env variables (in bash) as follows:
export DB2INSTANCE=dbinst2
export ODBCINI=/etc/odbc.ini
export ODBCINSTINI=/etc/odbcinst.ini

When I run isql I get the following error:

isql -v sample dbinst2 ibmdb2
[IM004][unixODBC][Driver Manager]Driver's SQLAllocHandle on SQL_HANDLE_HENV failed.

Any help would be greatly appreciated. Perhaps I'm not referencing the correct driver? I have tried multiple setups but I keep getting caught with this error.