diff --git a/math/mathmod/files/patch-fparser_fparser.cc b/math/mathmod/files/patch-fparser_fparser.cc
new file mode 100644
index 000000000000..4136548a6c4f
--- /dev/null
+++ b/math/mathmod/files/patch-fparser_fparser.cc
@@ -0,0 +1,10 @@
+--- fparser/fparser.cc.orig	2020-02-17 14:23:01 UTC
++++ fparser/fparser.cc
+@@ -18,6 +18,7 @@
+ #include <cmath>
+ #include <cassert>
+ #include <limits>
++#include <sys/types.h>
+ 
+ #include "extrasrc/fptypes.hh"
+ #include "extrasrc/fpaux.hh"