Functions such as fribidi_utf8_to_unicode and fribidi_unicode_to_utf8 are still present but no longer made available. To keep using it as if there were API compatibility, I had to resort to manually declare them in my code. 

#if defined(FRIBIDI_MINOR_VERSION) && FRIBIDI_MINOR_VERSION == 19
/** Needed because fribidi2 doesn't export those symbols in the 0.19.1 release */
#define fribidi_utf8_to_unicode FRIBIDI_NAMESPACE(utf8_to_unicode)
#define fribidi_unicode_to_utf8 FRIBIDI_NAMESPACE(unicode_to_utf8)
extern "C" {
FriBidiStrIndex fribidi_utf8_to_unicode (
  const char *s,
  FriBidiStrIndex length,
  FriBidiChar *us
);
FRIBIDI_ENTRY FriBidiStrIndex fribidi_unicode_to_utf8 (
  const FriBidiChar *us,
  FriBidiStrIndex length,
  char *s
);
};
#endif