Also, g_utf8_make_valid is introduced in 2.51.0, but changed from 2.51.4 to 2.51.5:
//glib-2.51.4/glib/gunicode.h gchar *g_utf8_make_valid(const gchar *str);
//glib-2.51.5/glib/gunicode.h gchar *g_utf8_make_valid(const gchar *str, gssize len);
The minimum version should be 2.51.5, instead of 2.51.0 in the symbols file.
Also, g_utf8_make_valid is introduced in 2.51.0, but changed from 2.51.4 to 2.51.5:
//glib- 2.51.4/ glib/gunicode. h make_valid( const gchar *str);
gchar *g_utf8_
//glib- 2.51.5/ glib/gunicode. h make_valid( const gchar *str, gssize len);
gchar *g_utf8_
The minimum version should be 2.51.5, instead of 2.51.0 in the symbols file.