system() function

I have a problem and the solution should works under windows and unix
OS.

Suppose I have a program ex.c in the directory X (so the current
working directory of ex.c is X).

Also suppose I have this code fragment:
....
char otherpath[PATHLEN];
char cmd[CMDLEN];
....
....
otherpath="Y" //where y is a valid path string
....
system(cmd); //where cmd is any command string
....



If in cmd is specified a relative path, it is relative to the current
working directory(in this example is X).

There is a way to execute command wich paths are relatives to the
"otherpath" variable (in this example is Y)?

.

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