On the other hand,
sometimes a file depends on another file
that is not detected by an SCons scanner.
For this situation,
SCons allows you to specific explicitly that one file
depends on another file,
and must be rebuilt whenever that file changes.
This is specified using the Depends method:
hello = Program('hello.c')
Depends(hello, 'other_file')
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% scons -Q hello
cc -c hello.c -o hello.o
cc -o hello hello.o
% scons -Q hello
scons: `hello' is up to date.
% edit other_file
[CHANGE THE CONTENTS OF other_file]
% scons -Q hello
cc -c hello.c -o hello.o
cc -o hello hello.o
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