diff --git a/nt/mingw-cfg.site b/nt/mingw-cfg.site
index e8b4711f548..68e264fde4c 100644
--- a/nt/mingw-cfg.site
+++ b/nt/mingw-cfg.site
@@ -178,9 +178,11 @@ gl_cv_func_printf_sizes_c99=yes
 gl_cv_func_printf_long_double=yes
 gl_cv_func_printf_infinite_long_double=yes
 gl_cv_func_printf_directive_a=yes
+gl_cv_func_printf_directive_b=yes
 gl_cv_func_printf_directive_f=yes
 gl_cv_func_printf_directive_n=yes
 gl_cv_func_printf_directive_ls=yes
+gl_cv_func_printf_directive_lc=yes
 gl_cv_func_printf_positions=yes
 gl_cv_func_printf_flag_grouping=yes
 gl_cv_func_printf_flag_leftadjust=yes