1 files changed, 1 insertions, 0 deletions
diff --git a/io.cc b/io.cc
index 82502f0..fc08a69 100644
--- a/io.cc
+++ b/io.cc
@@ -24,6 +24,7 @@
 #include <errno.h>
 #include <string.h> // strerror
 #include <pwd.h>    // getpwuid
+#include <stdlib.h> // getenv
 
 #include <map>