include file only if it exists

is there way include file if exists?


i want publish project of mine github.
but there values defined can change not critical projects source code.

for example number of leds defined @ beginning of code can change depending on hardware using.
i think won't if commit "fixed typo" include change value.

another scenario password should not exposed in git repository.


so think need this:

code: [select]

if ( exist(custom_values.h) ) {
  #include "custom_values.h"
} else {
  #include "default_values.h"
}
i ".gitignore" custom_values.h , sketch still run people clone repository.


but maybe there better approach problem.
i beginner arduino , git.  

usually not done in code. cf this question

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