Hi, I've just recently installed OpenInventor 2.1 on my Linux system (SuSE 6.3, glibc 2.1.2) and when I try to compile an application that uses OI, I get the following errors: /usr/include/bits/mathcalls.h:54: declaration of C function `float acos(float)' conflicts with /usr/include/bits/mathcalls.h:54: previous declaration `double acos(double)' here