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-rw-r--r--cpukit/libcsupport/src/isatty_r.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/cpukit/libcsupport/src/isatty_r.c b/cpukit/libcsupport/src/isatty_r.c
index d720d7a927..3e2e2baa14 100644
--- a/cpukit/libcsupport/src/isatty_r.c
+++ b/cpukit/libcsupport/src/isatty_r.c
@@ -21,6 +21,7 @@
#if defined(RTEMS_NEWLIB) && !defined(HAVE__ISATTY_R)
+#include <unistd.h>
#include <reent.h>
#include <sys/stat.h>