DKMS make.log for fglrx-13.251 for kernel 3.13.0-17-generic (x86_64) Fri Mar 14 01:56:31 EDT 2014 AMD kernel module generator version 2.1 doing Makefile based build for kernel 2.6.x and higher rm -rf *.c *.h *.o *.ko *.a .??* *.symvers make -C /lib/modules/3.13.0-17-generic/build SUBDIRS=/var/lib/dkms/fglrx/13.251/build/2.6.x modules make[1]: Entering directory `/usr/src/linux-headers-3.13.0-17-generic' CC [M] /var/lib/dkms/fglrx/13.251/build/2.6.x/firegl_public.o /var/lib/dkms/fglrx/13.251/build/2.6.x/firegl_public.c: In function ‘KCL_GetEffectiveUid’: /var/lib/dkms/fglrx/13.251/build/2.6.x/firegl_public.c:1758:5: error: incompatible types when returning type ‘kuid_t’ but ‘KCL_TYPE_Uid’ was expected return current_euid(); ^ /var/lib/dkms/fglrx/13.251/build/2.6.x/firegl_public.c:1762:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ make[2]: *** [/var/lib/dkms/fglrx/13.251/build/2.6.x/firegl_public.o] Error 1 make[1]: *** [_module_/var/lib/dkms/fglrx/13.251/build/2.6.x] Error 2 make[1]: Leaving directory `/usr/src/linux-headers-3.13.0-17-generic' make: *** [kmod_build] Error 2 build failed with return value 2