We use our own bc(1)

Index: bcal.1
--- bcal.1.orig
+++ bcal.1
@@ -7,7 +7,7 @@ bcal \- Storage expression calculator.
 .B bcal
 (Byte CALculator) is a command-line utility to help with numerical calculations and expressions involving binary prefixes, SI/IEC conversion, byte addressing, base conversion, LBA/CHS calculation etc.
 .PP
-It invokes GNU \fBbc\fR for non-storage expressions. Alternatively, it can also invoke \fBcalc\fR (\fIhttp://www.isthe.com/chongo/tech/comp/calc/\fR). To use \fBcalc\fR:
+It invokes \fBbc\fR for non-storage expressions. Alternatively, it can also invoke \fBcalc\fR (\fIhttp://www.isthe.com/chongo/tech/comp/calc/\fR). To use \fBcalc\fR:
 .PP
 .EX
 .B export BCAL_USE_CALC=1