same fix for cgm...

1 files changed, 2 insertions, 0 deletions

diff --git a/src/wolff_cgm.cpp b/src/wolff_cgm.cpp
index 1574308..10477bd 100644
--- a/src/wolff_cgm.cpp
+++ b/src/wolff_cgm.cpp
@@ -111,6 +111,7 @@ int main(int argc, char *argv[]) {
   } else {
     // a more complex example: measure the average magnetization, and draw the spin configuration to the screen
 
+#ifdef HAVE_GLUT
     // initialize glut
     glutInit(&argc, argv);
     glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
@@ -144,6 +145,7 @@ int main(int argc, char *argv[]) {
       }
       glFlush();
     };
+#endif
   }
 
   // run wolff for N cluster flips