Skipping incompatible lclntsh

Received this error whilst make-ing OCI8 for PHP. It was a fresh install of 64-bit CentOS 5.4 w/ Oracle XE 10g installed; e.g.,

/usr/bin/ld: skipping incompatible /usr/lib/oracle/10.2.0.4/client/lib/libclntsh.so when searching for -lclntsh
/usr/bin/ld: cannot find -lclntsh

So I checked for /usr/lib/oracle/10.2.0.4/client/lib/libclntsh.so – it exists, but for some reason it was “incompatible”. Google is helpful once again. The problem was that the 10g RPM was 32-bit, but I was trying to compiling a 64-bit version of OCI8.

To resolve the issue, install the 64-bit version of the -basic, -devel versions of Oracle Instant Client, then specify this path in configure; e.g.,

phpize
./configure -with-oci8=instantclient,/usr/lib/oracle/11.2/client64/lib
sudo make
sudo make install