Version 1:15.9-4~deb8u2 gives the same errors. Here is content of /var/lib/dkms/fglrx/15.9/build/make.log
DKMS make.log for fglrx-15.9 for kernel 4.4.0-1-amd64 (x86_64) So apr 2 16:31:36 CEST 2016 make: Entering directory '/usr/src/linux-headers-4.4.0-1-amd64' LD /var/lib/dkms/fglrx/15.9/build/built-in.o CC [M] /var/lib/dkms/fglrx/15.9/build/firegl_public.o /var/lib/dkms/fglrx/15.9/build/firegl_public.c: In function ‘firegl_major_proc_read’: /var/lib/dkms/fglrx/15.9/build/firegl_public.c:639:9: error: void value not ignored as it ought to be len = seq_printf(m, "%d\n", major); ^ /var/lib/dkms/fglrx/15.9/build/firegl_public.c: In function ‘KCL_fpu_save_init’: /var/lib/dkms/fglrx/15.9/build/firegl_public.c:6516:49: error: ‘XSTATE_FP’ undeclared (first use in this function) if (!(fpu->state.xsave.header.xfeatures & XSTATE_FP)) ^ /var/lib/dkms/fglrx/15.9/build/firegl_public.c:6516:49: note: each undeclared identifier is reported only once for each function it appears in /var/lib/dkms/fglrx/15.9/build/firegl_public.c: At top level: /var/lib/dkms/fglrx/15.9/build/firegl_public.c:6506:12: warning: ‘KCL_fpu_save_init’ defined but not used [-Wunused-function] static int KCL_fpu_save_init(struct task_struct *tsk) ^ /usr/src/linux-headers-4.4.0-1-common/scripts/Makefile.build:263: recipe for target '/var/lib/dkms/fglrx/15.9/build/firegl_public.o' failed make[3]: *** [/var/lib/dkms/fglrx/15.9/build/firegl_public.o] Error 1 /usr/src/linux-headers-4.4.0-1-common/Makefile:1401: recipe for target '_module_/var/lib/dkms/fglrx/15.9/build' failed make[2]: *** [_module_/var/lib/dkms/fglrx/15.9/build] Error 2 Makefile:146: recipe for target 'sub-make' failed make[1]: *** [sub-make] Error 2 Makefile:8: recipe for target 'all' failed make: *** [all] Error 2 make: Leaving directory '/usr/src/linux-headers-4.4.0-1-amd64' -- Rudolf Dovičín Partizánska 1506/92-34 957 01 Bánovce nad Bebravou 1 SLOVENSKO mailto:rudolf.dovi...@gmail.com xmpp:ruw...@jabbim.sk (cellular: +421 940 872 846, short messages only)