diff --git a/configure b/configure
index 7a96e9a..5b716ba 100755
--- a/configure
+++ b/configure
@@ -12185,6 +12185,69 @@ fi
 # Check for systems which need -lsocket and -lnsl
 #AX_LIB_SOCKET_NSL
 
+# Check for the math library (needed by cjson on some platforms)
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing floor" >&5
+$as_echo_n "checking for library containing floor... " >&6; }
+if ${ac_cv_search_floor+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char floor ();
+int
+main ()
+{
+return floor ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' m; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_floor=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if ${ac_cv_search_floor+:} false; then :
+  break
+fi
+done
+if ${ac_cv_search_floor+:} false; then :
+
+else
+  ac_cv_search_floor=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_floor" >&5
+$as_echo "$ac_cv_search_floor" >&6; }
+ac_res=$ac_cv_search_floor
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+else
+
+echo "floor()"
+exit 1
+
+fi
+
+
 # Solaris puts nanosleep in -lrt
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing nanosleep" >&5
 $as_echo_n "checking for library containing nanosleep... " >&6; }