@@ -668,6 +668,17 @@ int main(void){ $func(); }

 EOF

 }

+check_mathfunc(){

+    log check_func "$@"

+    func=$1

+    shift

+    disable $func

+    check_ld "$@" <<EOF && enable $func

+#include <math.h>

+int main(void){ $func(0); return 0; }

+EOF

+}

+

 check_func_headers(){

     log check_func_headers "$@"

     headers=$1

@@ -2519,16 +2530,16 @@ done

 check_lib math.h sin -lm

 check_lib va/va.h vaInitialize -lva

-check_func exp2

-check_func exp2f

-check_func llrint

-check_func log2

-check_func log2f

-check_func lrint

-check_func lrintf

-check_func round

-check_func roundf

-check_func truncf

+check_mathfunc exp2

+check_mathfunc exp2f

+check_mathfunc llrint

+check_mathfunc log2

+check_mathfunc log2f

+check_mathfunc lrint

+check_mathfunc lrintf

+check_mathfunc round

+check_mathfunc roundf

+check_mathfunc truncf

 # these are off by default, so fail if requested and not available

 enabled avisynth   && require2 vfw32 "windows.h vfw.h" AVIFileInit -lavifil32