It will help members of this forum if you can post us which version of the dbx tool you are using.
To do that, all you need to execute is :
#dbx <Return>
(dbx) version
(system outputs all the version numbers of the developer tools versions from SUN that it can find e.g.
Machine hardware:sun4u
OS version: 5.7
Processor type:sparc
Hardware:SUNW,Ultra-1
The following components are installed on your system:
Sun Visual WorkShop C++ 5.0
Sun WorkShop Compiler C 5.0
Sun WorkShop Compiler C++ 5.0
Sun WorkShop Tools.h++ 7.0
Sun WorkShop Standard 64-bit Class Library 2.0 for C++
Sun WorkShop Garbage Collector Libraries 1.0 for C++
Sun WorkShop Visual 3.0
Sun WorkShop IPE 5.0
Sun WorkShop TeamWare 2.1
Sun WorkShop FileMerge 3.1
Sun WorkShop Dbx 5.0
Sun WorkShop Performance Analyzer 5.0
Sun WorkShop LoopTool 2.2
Sun WorkShop LockLint 2.2
XEmacs 20.4 Source Distribution
Sun WorkShop Compilers C/C++ 5.0
Sun WorkShop Compiler C++ 5.0
Sun WorkShop Compiler C 5.0
Sun WorkShop IPE 5.0
Sun WorkShop Tools.h++ 7.0
Sun WorkShop Standard 64-bit Class Library 2.0 for C++
Sun WorkShop Garbage Collector Libraries 1.0 for C++
Sun WorkShop TeamWare 2.1
Sun WorkShop TeamWare 2.1
Allen Lai
SUN Microsystems