Big change in upgrading build system from Fedora 20 to Fedora 21.
Required changing many of the support programs and libraries.

Released 0.49 2015 03/20
Upgraded to Fedora 21 base system
kernel 4.0-rc4 2015/03/16 (bz4x0.rc4)
kernel 3.10.72 2015/03/18 (bz3x10.72)
kernel 3.14.36 2015/03/18 (bz3x14.36)
kernel 3.19.2 2015/03/18 (bz3x19.2)
kernel 3.19.2 now default kernel
kernel 3.12.39 2015/03/19 (bz3x12.39)

ftp://amd64gcc.dyndns.org/g4l0.49alpha/
Directory has the latest files.