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.

This fix is included in Solaris 2.5+.

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