setting check attribute for header files

Hello,

I would like to use the c_md5 check attribute for header and source
files in my work directory, without changing the DEFAULTCHECK value.
The reason is I have a project where aap checks large header files
from $HOME/include directory and it takes a really long time with
DEFAULTCHECK = c_md5.

I tried the :attribute command in main.aap as follows:

----------------------------------------------------------------
:attribute {check = c_md5} hello.h hello.c
:program  hello : hello.c
----------------------------------------------------------------

However, this builds the target from scratch every time, even 
if source files are not changed at all. 
Is this a bug or am I missing something?

Thank you,

Pavol

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