WARNING: externs should be avoided in .c files
WARNING: line length of 101 exceeds 80 columns
WARNING: line length of 82 exceeds 80 columns
WARNING: line length of 83 exceeds 80 columns
WARNING: line length of 85 exceeds 80 columns
WARNING: line length of 90 exceeds 80 columns
WARNING: line length of 91 exceeds 80 columns
WARNING: line length of 92 exceeds 80 columns
WARNING: line length of 94 exceeds 80 columns
WARNING: line length of 97 exceeds 80 columns
WARNING: line length of 98 exceeds 80 columns
WARNING: line length of 99 exceeds 80 columns