Hi,

When compiling with './autogen.sh && ./configure CC=clang && make':

    [...]
    xfns.c:2041:6: warning: format specifies type 'unsigned int' but the argument has type 'int' [-Wformat]
     2040 |           sprintf (css, "scrollbar slider { background-color: #%02x%02x%02x; }",
          |                                                                ~~~~
          |                                                                %02x
     2041 |                    color.red >> 8, color.green >> 8, color.blue >> 8);
    [...]

This warning is harmless, but interestingly 'gcc -Wformat-signedness'
does not warn about it, but 'clang -Wformat-signedness' does.

Since the color fields of struct XColor are 'unsigned short' and the
constant is an 'int', the expression should be an 'int'.

Anyways, the attached patch silences the warnings.

Collin