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-rw-r--r--src/drivers/Posix/Fl_Posix_System_Driver.H1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/drivers/Posix/Fl_Posix_System_Driver.H b/src/drivers/Posix/Fl_Posix_System_Driver.H
index dc5fe83a2..c1f9988f5 100644
--- a/src/drivers/Posix/Fl_Posix_System_Driver.H
+++ b/src/drivers/Posix/Fl_Posix_System_Driver.H
@@ -26,6 +26,7 @@
#define FL_POSIX_SYSTEM_DRIVER_H
#include <FL/Fl_System_Driver.H>
+#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>