add missing #include

diff --git a/lib/expr/exerror.c b/lib/expr/exerror.c
index 5b58de337b4bb7a787350b4c2ff452ec487ded00..bb0e1ea3f46f483ed22ac38b4af61ba5db8f2fdc 100644 (file)
--- a/lib/expr/exerror.c
+++ b/lib/expr/exerror.c
@@ -16,6 +16,7 @@
  */
 
 #include <expr/exlib.h>
+#include <stdarg.h>
 
 /*
  * library error handler