the libraries are not missing but the symbol is only available in 64bit: $ nm /usr/lib/hpux64/libl.so.1 | grep yylsp [67] | 0| 0|OBJT |GLOB |0| UNDEF|yylsp $ nm /usr/lib/hpux32/libl.so.1 | grep yylsp [67] | 0| 0|OBJT |GLOB |0| UNDEF|yylsp