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-rw-r--r--stdlib/isomac.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/stdlib/isomac.c b/stdlib/isomac.c
index 37f564c82a..7d743cb8e5 100644
--- a/stdlib/isomac.c
+++ b/stdlib/isomac.c
@@ -74,6 +74,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #define HEADER_MAX          256