Where can I add "-lm" flag to compile tc-*.c

[jw c]

Hello, I modified one of tc-*.c just for personal
perpose.
The new code includes some math functions such as
pow(), log().
And also I added #include <math.h> line. 

But I can't find the proper place to add "-lm" flag.
I found as_new_LDFLAG in the gas build directory's
Makefile.
But I think I better change a file in the source
directory.

Which file should I change to compile tc-*.c file
correctly?

Thanks.

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