I am trying to write a program that simulates 6 different page replacement algorithms. The program is written in C++ on a Windows XP machine under Visual Studio .NET 2003. I am trying to port the program over to linux, but I am running into a problem. At this moment I am only trying to only compile main and my class that runs the fifo algorithm. I have another class which reprseents the page references as they come in. In my makefile I compile all of these files and try to create an executable. If I type make in the terminal then I get the following errors:

g++ -c PageReference.cpp
g++ -c FIFOPageReplacement.cpp
g++ -c main.cpp
g++ -o pagerefsim main.o
main.o(.text+0x99): In function `main':
: undefined reference to `FIFOPageReplacement::FIFOPageReplacement[in-charge](int)'
main.o(.text+0x140): In function `main':
: undefined reference to `PageReference::PageReference[in-charge](int, char)'
main.o(.text+0x1a3): In function `main':
: undefined reference to `FIFOPageReplacement::add(PageReference*)'
main.o(.text+0x1ba): In function `main':
: undefined reference to `FIFOPageReplacement::run()'
main.o(.text+0x1d3): In function `main':
: undefined reference to `FIFOPageReplacement:rint(std::basic_ofstream<char, std::char_traits<char> >&)'
collect2: ld returned 1 exit status
make: *** [pagerefsim] Error 1

Does anyone have any idea how to fix this problem?

Thanks.

You "fix it" by including all your object files when trying to create the executable

For instance:
The linker is complaining because it cannot find the implementation of the FIFOPageReplacement constructor and other member functions. Your main.o does not automatically include that information; it's all in your other .o files. If those files aren't "ready for primetime" because you're still porting them, then you'll have to wait until they're finished, or temporarily comment out any references to them in main.c until they are ready.