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-rw-r--r--fluid/fluid.cxx3
1 files changed, 3 insertions, 0 deletions
diff --git a/fluid/fluid.cxx b/fluid/fluid.cxx
index 5e3100df5..747135429 100644
--- a/fluid/fluid.cxx
+++ b/fluid/fluid.cxx
@@ -17,6 +17,9 @@
//
#include <FL/Fl.H>
+#ifdef __APPLE__
+#include <FL/x.H> // for fl_open_callback
+#endif
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Button.H>