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-rw-r--r--test/threads.cxx2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/threads.cxx b/test/threads.cxx
index c7fecffb6..c07b2ea9f 100644
--- a/test/threads.cxx
+++ b/test/threads.cxx
@@ -41,7 +41,7 @@ void magic_number_cb(void *p)
w->redraw_label();
}
-void* prime_func(void* p)
+extern "C" void* prime_func(void* p)
{
Fl_Browser* browser = (Fl_Browser*) p;
Fl_Value_Output *value;