Does this system need -fPIC?
R cannot be expected to know the settings needed in config.site for all
possible systems, and as you will see from the notes in configure.ac,
ppc32 does not appear to need -fPIC according to the gcc documentation.
Indeed, the manual INSTALL asked you to read says:
Full_Name: Luca Barbato
Version: 2.3.1
OS: Gentoo Linux/PPC
Submission from: (NULL) (151.44.163.144)
system informations
Portage 2.1 (default-linux/ppc/ppc32/2006.0/G4, gcc-4.1.1, glibc-2.4-r3,
2.6.17-rc5 ppc)
=
System uname: 2.6.17