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-rw-r--r--src/unix/PidFile.hxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/unix/PidFile.hxx b/src/unix/PidFile.hxx
index 3f97484a1..46b6fbb54 100644
--- a/src/unix/PidFile.hxx
+++ b/src/unix/PidFile.hxx
@@ -26,6 +26,7 @@
#include <assert.h>
#include <unistd.h>
+#include <stdlib.h>
#include <fcntl.h>
class PidFile {