make
  CC [M]  /home/hello/Desktop/backport/backports-4.0.1-1/compat/main.o
/home/hello/Desktop/backport/backports-4.0.1-1/compat/main.c:51:1: warning: data definition has no type or storage class
 EXPORT_SYMBOL_GPL(backport_dependency_symbol);
 ^
/home/hello/Desktop/backport/backports-4.0.1-1/compat/main.c:51:1: error: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’ [-Werror=implicit-int]
/home/hello/Desktop/backport/backports-4.0.1-1/compat/main.c:51:1: warning: parameter names (without types) in function declaration
cc1: some warnings being treated as errors
scripts/Makefile.build:257: recipe for target '/home/hello/Desktop/backport/backports-4.0.1-1/compat/main.o' failed
make[6]: *** [/home/hello/Desktop/backport/backports-4.0.1-1/compat/main.o] Error 1
scripts/Makefile.build:404: recipe for target '/home/hello/Desktop/backport/backports-4.0.1-1/compat' failed
make[5]: *** [/home/hello/Desktop/backport/backports-4.0.1-1/compat] Error 2
Makefile:1345: recipe for target '_module_/home/hello/Desktop/backport/backports-4.0.1-1' failed
make[4]: *** [_module_/home/hello/Desktop/backport/backports-4.0.1-1] Error 2
Makefile.build:6: recipe for target 'modules' failed
make[3]: *** [modules] Error 2
Makefile.real:88: recipe for target 'modules' failed
make[2]: *** [modules] Error 2
Makefile:40: recipe for target 'modules' failed
make[1]: *** [modules] Error 2
Makefile:30: recipe for target 'default' failed
make: *** [default] Error 2