1 files changed, 1 insertions, 1 deletions
diff --git a/FL/glut.H b/FL/glut.H
index 5ed214363..29542f60d 100644
--- a/FL/glut.H
+++ b/FL/glut.H
@@ -238,7 +238,7 @@ enum {GLUT_LEFT, GLUT_ENTERED};
 inline void glutVisibilityFunc(void (*f)(int s)) {glut_window->visibility=f;}
 enum {GLUT_NOT_VISIBLE, GLUT_VISIBLE};
 
-inline void glutIdleFunc(void (*f)()) {Fl::set_idle(f);}
+FL_EXPORT void glutIdleFunc(void (*f)());
 
 // Warning: this cast may not work on all machines:
 inline void glutTimerFunc(unsigned int msec, void (*f)(int), int value) {