--- configure.orig	2013-03-03 11:29:18.000000000 +0100
+++ configure	2013-03-08 19:04:01.903917043 +0100
@@ -3265,7 +3265,7 @@
 echores "$_kstat"
 
 
-for func in atanf cbrt cbrtf cosf expf exp2 exp2f isnan isinf llrint llrintf log2 log2f log10f lrint lrintf rint round roundf sinf trunc truncf; do
+for func in atanf cbrt cbrtf cosf expf exp2 exp2f isnan isinf llrint llrintf lrint lrintf rint round roundf sinf trunc truncf; do
 echocheck $func
 eval _$func=no
 statement_check math.h "${func}(2.0)" -D_ISOC99_SOURCE && eval _$func=yes
@@ -3278,6 +3278,9 @@
 fi
 done
 
+for func in log2 log2f log10f; do
+  eval def_$func="\"#define HAVE_$(echo $func | tr '[a-z]' '[A-Z]') 0\""
+done
 
 for func in atan2f ldexpf powf; do
 echocheck $func
