--- a/Libraries/plist/Sources/Format/Encoding.cpp
+++ b/Libraries/plist/Sources/Format/Encoding.cpp
@@ -11,6 +11,7 @@
 #include <plist/Format/unicode.h>
 
 #include <cassert>
+#include <cstdlib> /* abort() */
 
 #if defined(__linux__)
 #include <endian.h>