--- kcollectd-0.9.orig/kcollectd/graph.cc	2010-01-31 21:40:10.000000000 +0300
+++ kcollectd-0.9/kcollectd/graph.cc	2016-07-11 13:10:40.602522957 +0300
@@ -564,9 +564,9 @@
       paint.setPen(Qt::NoPen);
       paint.setBrush(QBrush(color_minmax[color_nr++ % 8]));
       for(int i=0; i<size; ++i) {
-	while (i<size && (isnan(min_data[i]) || isnan(max_data[i]))) ++i;
+	while (i<size && (std::isnan(min_data[i]) || std::isnan(max_data[i]))) ++i;
 	int l = i;
-	while (i<size && !isnan(min_data[i]) && !isnan(max_data[i])) ++i;
+	while (i<size && !std::isnan(min_data[i]) && !std::isnan(max_data[i])) ++i;
 	const int asize = i-l;
 	points.resize(asize*2);
 	int k;
@@ -597,9 +597,9 @@
     if (!avg_data.empty()) {
       paint.setPen(color_line[color_nr++ % 8]);
       for(int i=0; i<size; ++i) {
-	while (i<size && isnan(avg_data[i])) ++i;
+	while (i<size && std::isnan(avg_data[i])) ++i;
 	int l = i;
-	while (i<size && !isnan(avg_data[i])) ++i;
+	while (i<size && !std::isnan(avg_data[i])) ++i;
 	const int asize = i-l;
 	points.resize(asize);
 	for(int k=0; k<asize; ++k, ++l) {
--- kcollectd-0.9.orig/misc.cc	2009-05-10 17:42:08.000000000 +0400
+++ kcollectd-0.9/kcollectd/misc.cc	2016-07-11 13:10:59.955079187 +0300
@@ -119,7 +119,7 @@
   // process avg_data
   if (!avg_data.empty()) {
     for(std::size_t i=0; i<size; ++i) {
-      if (isnan(avg_data[i])) continue;
+      if (std::isnan(avg_data[i])) continue;
       valid = true;
       if (min > avg_data[i]) min = avg_data[i];
       if (max < avg_data[i]) max = avg_data[i];
@@ -129,7 +129,7 @@
   // process min/max-data
   if (!min_data.empty() && !max_data.empty()) {  
     for(std::size_t i=0; i<size; ++i) {
-      if (isnan(min_data[i]) || isnan(max_data[i])) continue;
+      if (std::isnan(min_data[i]) || std::isnan(max_data[i])) continue;
       valid = true;
       if (min > min_data[i]) min = min_data[i];
       if (max < min_data[i]) max = min_data[i];