diff -up libqalculate-0.9.7/libqalculate/util.cc.buffer libqalculate-0.9.7/libqalculate/util.cc
--- libqalculate-0.9.7/libqalculate/util.cc.buffer	2009-12-02 21:24:27.000000000 +0100
+++ libqalculate-0.9.7/libqalculate/util.cc	2016-04-25 13:41:49.889530190 +0200
@@ -26,8 +26,6 @@ bool eqstr::operator()(const char *s1, c
 	return strcmp(s1, s2) == 0;
 }
 
-char buffer[20000];
-
 string date2s(int year, int month, int day) {
 	string str = i2s(year);
 	str += "-";
@@ -522,36 +520,54 @@ string& remove_parenthesis(string &str)
 
 string d2s(double value, int precision) {
 	//	  qgcvt(value, precision, buffer);
-	sprintf(buffer, "%.*G", precision, value);
+   char *buffer = NULL;
+	if (asprintf(&buffer, "%.*G", precision, value) == -1)
+      exit(EXIT_FAILURE);
 	string stmp = buffer;
+   free(buffer);
 	//	  gsub("e", "E", stmp);
 	return stmp;
 }
 
 string p2s(void *o) {
-	sprintf(buffer, "%p", o);
+   char *buffer = NULL;
+	if (asprintf(&buffer, "%p", o) == -1)
+      exit(EXIT_FAILURE);
 	string stmp = buffer;
+   free(buffer);
 	return stmp;
 }
 string i2s(int value) {
 	//	  char buffer[10];
-	sprintf(buffer, "%i", value);
+	char *buffer = NULL;
+	if (asprintf(&buffer, "%i", value) == -1)
+      exit(EXIT_FAILURE);
 	string stmp = buffer;
+   free(buffer);
 	return stmp;
 }
 string i2s(long int value) {
-	sprintf(buffer, "%li", value);
+   char *buffer = NULL;
+	if (asprintf(&buffer, "%li", value) == -1)
+      exit(EXIT_FAILURE);
 	string stmp = buffer;
+   free(buffer);
 	return stmp;
 }
 string i2s(unsigned int value) {
-	sprintf(buffer, "%u", value);
+   char *buffer = NULL;
+	if (asprintf(&buffer, "%u", value) == -1)
+      exit(EXIT_FAILURE);
 	string stmp = buffer;
+   free(buffer);
 	return stmp;
 }
 string i2s(unsigned long int value) {
-	sprintf(buffer, "%lu", value);
+   char *buffer = NULL;
+	if (asprintf(&buffer, "%lu", value) == -1)
+      exit(EXIT_FAILURE);
 	string stmp = buffer;
+   free(buffer);
 	return stmp;
 }
 const char *b2yn(bool b, bool capital) {