Sun compiler and /usr/local/include

[Charles Brown]

Very new to automake, and can't find an answer to this; What would be 
put in configure.ac to determine whether the detected 
preprocessor/compiler automatically supplies -I/usr/local/include (for 
example, g++ does, but sun CC does not), and if not, how to add it to 
some CFLAGS variable?

I tried slamming it into AM_CPPFLAGS, but this didn't get me anything.
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