Error(s):

source_file.c:2:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
 main(){ // gcc compiler bug...? -dink (fbalpha)
 ^
source_file.c: In function ‘main’:
source_file.c:4:22: error: invalid suffix "-derp" on integer constant
  printf("hi! %x.\n", 0xbe-derp);
                      ^
source_file.c:3:6: warning: unused variable ‘derp’ [-Wunused-variable]
  int derp = 10;
      ^