Okay, after fully upgrading my system to yakkety, because what could possibly go wrong, I can reproduce.

configure:6958: checking for linux kernel module build works
make -C /lib/modules/4.4.0-22-generic/build M=/var/lib/dkms/openafs/1.6.18/build/conftest.dir modules KBUILD_VERBOSE=1
make: Entering directory '/usr/src/linux-headers-4.4.0-22-generic'
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 /var/lib/dkms/openafs/1.6.18/build/conftest.dir/.tmp_versions ; rm -f /var/lib/dkms/openafs/1.6.18/build/conftest.dir/.tmp_versions/*
make -f ./scripts/Makefile.build obj=/var/lib/dkms/openafs/1.6.18/build/conftest.dir
  gcc -Wp,-MD,/var/lib/dkms/openafs/1.6.18/build/conftest.dir/.conftest.o.d  -nostdinc -isystem /usr/lib/gcc/x86_64-linux-gnu/5/include  -I./arch/x86/include -Iarch/x86/include/generated/uapi -Iarch/x86/include/generated  -Iinclude -I./arch/x86/include/uapi -Iarch/x86/include/generated/uapi -I./include/uapi -Iinclude/generated/uapi -include ./include/linux/kconfig.h -Iubuntu/include  -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -std=gnu89 -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -m64 -falign-jumps=1 -falign-loops=1 -mno-80387 -mno-fp-ret-in-387 -mpreferred-stack-boundary=3 -mskip-rax-setup -mtune=generic -mno-red-zone -mcmodel=kernel -DCONFIG_X86_X32_ABI -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -DCONFIG_AS_FXSAVEQ=1 -DCONFIG_AS_SSSE3=1 -DCONFIG_AS_CRC32=1 -DCONFIG_AS_AVX=1 -DCONFIG_AS_AVX2=1 -DCONFIG_AS_SHA1_NI=1 -DCONFIG_AS_SHA256_NI=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -O2 -fstack-protector-strong -fno-omit-frame-pointer -fno-optimize-sibling-calls -pg -DCC_HAVE_ASM_GOTO  -DMODULE  -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(conftest)"  -D"KBUILD_MODNAME=KBUILD_STR(conftest)" -c -o /var/lib/dkms/openafs/1.6.18/build/conftest.dir/.tmp_conftest.o /var/lib/dkms/openafs/1.6.18/build/conftest.dir/conftest.c
scripts/Makefile.build:264: recipe for target '/var/lib/dkms/openafs/1.6.18/build/conftest.dir/conftest.o' failed
Makefile:1396: recipe for target '_module_/var/lib/dkms/openafs/1.6.18/build/conftest.dir' failed
make: Leaving directory '/usr/src/linux-headers-4.4.0-22-generic'
arch/x86/Makefile:133: stack-protector enabled but compiler support broken
Makefile:670: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler
/var/lib/dkms/openafs/1.6.18/build/conftest.dir/conftest.c:1:0: error: code model kernel does not support PIC mode
 /* confdefs.h */
 ^
make[1]: *** [/var/lib/dkms/openafs/1.6.18/build/conftest.dir/conftest.o] Error 1
make: *** [_module_/var/lib/dkms/openafs/1.6.18/build/conftest.dir] Error 2
configure: failed using Makefile:
| EXTRA_CFLAGS += 
| 
| obj-m += conftest.o
configure: and program was:
| /* confdefs.h */
| /* confdefs.h */
| #define PACKAGE_NAME "OpenAFS"
| #define PACKAGE_TARNAME "openafs"
| #define PACKAGE_VERSION "1.6.18-1-debian"
| #define PACKAGE_STRING "OpenAFS 1.6.18-1-debian"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL ""
| #define PACKAGE "openafs"
| #define VERSION "1.6.18-1-debian"
| #define STDC_HEADERS 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_UNISTD_H 1
| #define YYTEXT_POINTER 1
| #define ENDIANESS_IN_SYS_PARAM_H 1
| #define PRINTF_TAKES_Z_LEN 1
| /* end confdefs.h */
| #include <linux/module.h>
| #include <linux/sched.h>
| #include <linux/fs.h>
| 
| void conftest(void)
| {
| 
| }
| 
| MODULE_LICENSE("http://www.openafs.org/dl/license10.html");
configure:6999: result: no
configure:7001: error: in `/var/lib/dkms/openafs/1.6.18/build':
configure:7003: error: Fix problem or use --disable-kernel-module...