src/check_version.cpp |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/check_version.cpp b/src/check_version.cpp
index e968a05..6dfa062 100644
--- a/src/check_version.cpp
+++ b/src/check_version.cpp
@@ -8,6 +8,7 @@
 #include <string>
 #include <sstream>
 #include <iostream>
+#include <unistd.h>
 
 using namespace std;