#include <fontconfig.h>
int FcStrCmpIgnoreCase(const FcChar8 *s1, const FcChar8 *s2);
int FcStrCmpIgnoreCase
Returns the usual <0, 0, >0 result of comparing s1 and s2. This test is case-insensitive for all proper UTF-8 encoded strings.
Fontconfig version 2.8.0