diff -Nur calc-0.0.1-rc5/calc.c calc-0.0.1-rc5-n/calc.c
--- calc-0.0.1-rc5/calc.c	2004-07-18 20:53:54.000000000 +0200
+++ calc-0.0.1-rc5-n/calc.c	2006-11-07 02:37:26.000000000 +0100
@@ -72,7 +72,7 @@
   void AddDigit(eKeys key);
   void CalculateResult(char* inOperand1, char* inOperand2, char *outOperand, char cOperator);
   operType operatorSymbol;
-  void cCalcMain::CalculateResultTrig(char* inOperand1, char *outOperand, char cOperator, gradType calculateGradType);
+  void CalculateResultTrig(char* inOperand1, char *outOperand, char cOperator, gradType calculateGradType);
 public:
   cCalcMain(void);
   ~cCalcMain();
@@ -486,12 +486,12 @@
 {
   FILE *f;
 //  printf("inOperand1 %s inOperand2 %s operator %c\n",inOperand1,inOperand2,cOperator);
-  f = fopen("./bc_in.dat","w");
+  f = fopen("/tmp/bc_in.dat","w");
   fprintf(f,"scale = 10\n");
   fprintf(f,"%s%c%s\n",inOperand1,cOperator,inOperand2);
   fclose(f);
-  system("bc <./bc_in.dat >./bc_out.dat");
-  f = fopen("./bc_out.dat","r");
+  system("/usr/bin/bc </tmp/bc_in.dat >/tmp/bc_out.dat");
+  f = fopen("/tmp/bc_out.dat","r");
   if (f != NULL)
   {
     fscanf(f,"%s",outOperand);
@@ -499,6 +499,8 @@
   }
     else
     printf("VDR-Calc : bc run failed !!\n");
+  remove("/tmp/bc_in.dat");
+  remove("/tmp/bc_out.dat");
 }
 
 void cCalcMain::CalculateResultTrig(char* inOperand1, char *outOperand, char cOperator, gradType 				calculateGradType)
@@ -512,7 +514,7 @@
     CalculateResult(inOperand1, "(3.1415926535/200)",inOperand1, '*');
 
 //  printf("inOperand1 %s inOperand2 %s operator %c\n",inOperand1,inOperand2,cOperator);
-  f = fopen("./bc_in.dat","w");
+  f = fopen("/tmp/bc_in.dat","w");
   fprintf(f,"scale = 10\n");
 
 // only valid for cOperator == s, c, t (for sin,cos,tan)
@@ -525,8 +527,8 @@
     fprintf(f,"s(%s)/c(%s)\n",inOperand1,inOperand1);
   }
   fclose(f);
-  system("bc -l <./bc_in.dat >./bc_out.dat");
-  f = fopen("./bc_out.dat","r");
+  system("/usr/bin/bc -l </tmp/bc_in.dat >/tmp/bc_out.dat");
+  f = fopen("/tmp/bc_out.dat","r");
   if (f != NULL)
   {
     fscanf(f,"%s",outOperand);
@@ -534,6 +536,8 @@
   }
     else
     printf("VDR-Calc : bc run failed !!\n");
+  remove("/tmp/bc_in.dat");
+  remove("/tmp/bc_out.dat");
   clearOutputForNextDigit = true;
 }
 
diff -Nur calc-0.0.1-rc5/Makefile calc-0.0.1-rc5-n/Makefile
--- calc-0.0.1-rc5/Makefile	2006-11-07 02:04:33.000000000 +0100
+++ calc-0.0.1-rc5-n/Makefile	2006-11-07 02:37:26.000000000 +0100
@@ -16,7 +16,7 @@
 ### The C++ compiler and options:
 
 CXX      ?= g++
-CXXFLAGS ?= -O2 -Wall -Woverloaded-virtual
+CXXFLAGS ?= -fPIC -O2 -Wall -Woverloaded-virtual
 
 ### The directory environment: