linux - Makefile: Perform specific command when one file was updated after another one -

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i have makefile calls bash scripts , shell commands.
1 of scripts generates code (say, generated.h) file according code file (say source.h) - , want called if source.h updated after generated.h updated.
(in pseudo code: 

if update_time(generated.h) < update_time(source.h)     call generatecodefile.sh   end if

)

how can within makefile?

thanks.

generated.h: source.h     sh generatecodefile.sh

be aware that's literal <tab> character @ start of sh line.


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