In file included from arch/x86/decode.c:26:0:
arch/x86/../../elf.h:22:18: fatal error: gelf.h: No such file or directory
 #include <gelf.h>
                  ^
compilation terminated.
mv: cannot stat ‘/usr/src/linux-4.14.51/tools/objtool/arch/x86/.decode.o.tmp’: No such file or directory
make[4]: *** [/usr/src/linux-4.14.51/tools/objtool/arch/x86/decode.o] Error 1
make[3]: *** [arch/x86] Error 2
make[2]: *** [/usr/src/linux-4.14.51/tools/objtool/objtool-in.o] Error 2
make[1]: *** [objtool] Error 2
make: *** [tools/objtool] Error 2