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-rw-r--r--fluid/undo.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/fluid/undo.cxx b/fluid/undo.cxx
index 1982ffa7e..c0590f78e 100644
--- a/fluid/undo.cxx
+++ b/fluid/undo.cxx
@@ -31,6 +31,7 @@
#include <FL/Fl_Preferences.H>
#include "../src/flstring.h"
#if defined(WIN32) && !defined(__CYGWIN__)
+# include <io.h>
# include <windows.h>
# define getpid GetCurrentProcessId
#else