Dumb Question on GCC

[Martin Gainty]

GCC SlpReg.c
/cygdrive/h/DOCUME~1/ADMINI~1/LOCALS~1/Temp/ccwParH7.o(.text+0x11d):SLPReg.c
: un
defined reference to `_SLPOpen'

My header file refers to function SLPOpen not _SLPOpen
The .c file calls SLPOpen not _SLPOpen

Where does the leading underscore come from ?
How do I shut it off the compiler from introducing leading _?

Many Thanks,

Martin

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