DKMS make.log for nvidia-340.96 for kernel 4.2.7-300.fc23.x86_64 (x86_64)
Thu Dec 17 21:55:51 PST 2015

gcc-version-check failed:

The compiler used to compile the kernel (gcc
5.1) does not exactly match the current compiler
(gcc 5.3).  The Linux 2.6 kernel module loader
rejects kernel modules built with a version of gcc
that does not exactly match that of the compiler
used to build the running kernel.

If you know what you are doing and want to override
the gcc version check, you can do so by setting the
IGNORE_CC_MISMATCH environment variable to "1".

In any other case, set the CC environment variable
to the name of the compiler that was used to compile
the kernel.

*** Failed CC version check. Bailing out! ***

nvidia-modules-common.mk:201: recipe for target 'build-sanity-checks' failed
make: *** [build-sanity-checks] Error 1
make: Entering directory '/var/lib/dkms/nvidia/340.96/build/uvm'
cd ./..; make module SYSSRC=/lib/modules/4.2.7-300.fc23.x86_64/source SYSOUT=/lib/modules/4.2.7-300.fc23.x86_64/build KBUILD_EXTMOD=./..
make[1]: Entering directory '/var/lib/dkms/nvidia/340.96/build'
NVIDIA: calling KBUILD...
make[2]: Entering directory '/usr/src/kernels/4.2.7-300.fc23.x86_64'
make -C /lib/modules/4.2.7-300.fc23.x86_64/build KBUILD_SRC=/usr/src/kernels/4.2.7-300.fc23.x86_64 \
-f /usr/src/kernels/4.2.7-300.fc23.x86_64/Makefile modules
make[3]: Entering directory '/usr/src/kernels/4.2.7-300.fc23.x86_64'
test -e include/generated/autoconf.h -a -e include/config/auto.conf || (		\
echo >&2;							\
echo >&2 "  ERROR: Kernel configuration is invalid.";		\
echo >&2 "         include/generated/autoconf.h or include/config/auto.conf are missing.";\
echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
echo >&2 ;							\
/bin/false)
mkdir -p ./../.tmp_versions ; rm -f ./../.tmp_versions/*
make -f /usr/src/kernels/4.2.7-300.fc23.x86_64/scripts/Makefile.build obj=./..
/usr/src/kernels/4.2.7-300.fc23.x86_64/scripts/Makefile.build:44: /usr/src/kernels/4.2.7-300.fc23.x86_64/./../Makefile: No such file or directory
make[4]: *** No rule to make target '/usr/src/kernels/4.2.7-300.fc23.x86_64/./../Makefile'.  Stop.
/usr/src/kernels/4.2.7-300.fc23.x86_64/Makefile:1390: recipe for target '_module_./..' failed
make[3]: *** [_module_./..] Error 2
make[3]: Leaving directory '/usr/src/kernels/4.2.7-300.fc23.x86_64'
Makefile:146: recipe for target 'sub-make' failed
make[2]: *** [sub-make] Error 2
make[2]: Leaving directory '/usr/src/kernels/4.2.7-300.fc23.x86_64'
NVIDIA: left KBUILD.
nvidia.ko failed to build!
Makefile:184: recipe for target 'nvidia.ko' failed
make[1]: *** [nvidia.ko] Error 1
make[1]: Leaving directory '/var/lib/dkms/nvidia/340.96/build'
Makefile:219: recipe for target '../Module.symvers' failed
make: *** [../Module.symvers] Error 2
make: Leaving directory '/var/lib/dkms/nvidia/340.96/build/uvm'