When linking C++ programs, I get "_ex

When linking C++ programs, I get "_ex_keylock" undefined.

You installed a patch for your C++ compiler (101910 (SPARC) or
102486 (x86)) but forgot to install the required companion patch
for libC.so.5.

Fix: install patch 101242-10 (SPARC) or 102859-01 (x86) or later.