At long last, import the bcmath library, by Phil Nelson

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+BCMATH FAQ: 
+
+1) Why BCMATH?
+
+The math routines of GNU bc become more generally useful in a
+library form.  By separating the BCMATH library from GNU bc,
+GNU bc can be under the GPL and BCMATH can be under the LGPL.
+
+2) Why BCMATH when GMP exists?
+
+GMP has "integers" (no digits after a decimal), "rational numbers"
+(stored as 2 integers) and "floats".  None of these will correctly
+represent a POSIX BC number.  Floats are the closest, but will not
+behave correctly for many computations.  For example, BC numbers have
+a "scale" that represent the number of digits to represent after the
+decimal point.  The multiplying two of these numbers requires one to
+calculate an exact number of digits after the decimal point regardless
+of the number of digits in the integer part.  GMP floats have a
+"fixed, but arbitrary" mantissa and so multiplying two floats will end
+up dropping digits BC must calculate.
+