/in/foo.c: In function 'main':
/in/foo.c:11:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*' token
   int signal*;
             ^
/in/foo.c:11:14: error: expected expression before ';' token
   int signal*;
              ^
/in/foo.c:15:8: error: 'signal' undeclared (first use in this function)
    if (signal == 1)
        ^~~~~~
/in/foo.c:15:8: note: each undeclared identifier is reported only once for each function it appears in