Various guides to porting software from one Unix variant (or MS Windows) to another. For many purposes, useful information may be obtained from these guides even if the "source" platform doesn't match your own.
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IBM provides a number of porting references: the AIX 5L
a "compare and contrast" of Solaris 8 and AIX version 4.3 and version 5.1;
and finally, a "compare and contrast" of AIX
Darwin and Mac OS X
For Darwin users, we have a guide for porting Unix software to Darwin
and Mac OS X, the GNU-Darwin
Notes, and Apple's
Windows to OS X and
Unix to OS X porting guides.
Courtesy of Hewlett-Packard, we have the Linux Porting
Kit, and a guide to porting applications from Linux
to HP-UX; and a guide to porting from Solaris
to HP-UX 11.0.
IBM provides technical guides for porting applications
Solaris to Linux, and
Redhat also has a
Solaris to Linux Porting Guide.
Sun has documentation for transitioning to
SunOS 5.7 (a.k.a Solaris 7), Solaris 8,
and provides a Developer Kit for migrating
Solaris and Java.
Compaq provides reference guides for
porting from most major variants of Unix to Tru64
Unix, and the Tru64
Dr. Dobb's Journal has guides to porting C++ Code from NT to
Unix and Byte provides an article titled
the Windows Registry in Unix.