When this configuration constant is set to 0, functions designed to operate on strings (stStrLen, stStrCpy, stStrNCpy, stStrCat, stStrNCat, stStrCmp, stStrNCmp, stStrICmp, stStrNICmp, stStrUpr) are sourced from the Alternative C Library. When this value is set to 1, macros with the same names are created that utilize functions from the Standard C Library.