error: invalid operands to binary expression ('std::__1::basic_istream<char>' and 'nullptr_t')

Index: src/libannotate/addArcs.cpp
--- src/libannotate/addArcs.cpp.orig
+++ src/libannotate/addArcs.cpp
@@ -258,7 +258,7 @@ addArcs(PlanetProperties *planetProperties, Planet *pl
         {
             ifstream inFile(arcFile.c_str());
             char *line = new char[MAX_LINE_LENGTH];
-            while (inFile.getline (line, MAX_LINE_LENGTH, '\n') != NULL)
+            while (inFile.getline (line, MAX_LINE_LENGTH, '\n'))
                 readArcFile(line, planet, view, projection,
                             planetProperties, annotationMap);
             
@@ -292,7 +292,7 @@ addArcs(View *view, multimap<double, Annotation *> &an
         {
             ifstream inFile(arcFile.c_str());
             char *line = new char[256];
-            while (inFile.getline (line, 256, '\n') != NULL)
+            while (inFile.getline (line, 256, '\n'))
                 readArcFile(line, NULL, view, NULL, NULL, annotationMap);
 
             inFile.close();