/usr/bin/ld: skipping incompatible /u01/app/oracle/product/11.2.0/client_1/lib//libclntsh.so when searching for -lclntsh
/usr/bin/ld: cannot find -lclntsh

So, install a compatible oracle binaries, whatever they are , maybe "full client" versus "lite client", like mentioned in comments in http://www.pythian.com/blog/installing-tora-with-oracle-support-on-ubuntu-10-04-lucid-lynx/

update: or like  [google://skipping incompatible oracle libclntsh.so] skipping incompatible oracle libclntsh.so -> Bug #40854 for DBD-Oracle: ld: skipping incompatible /usr/lib/oracle/11.1/client/lib/libclntsh.so says, don't mix 32/64 bits

Which is same tips I've gathered over the years :) Re^3: DBD::mysql fail install check (DYLD_LIBRARY_PATH ldd otool install_name_tool VERSIONER_PERL_PREFER_32_BIT .bundle/.dylib/.so