Index: head/print/scribus-devel/files/patch-scribus_third__party_lib2geom_isnan.h
===================================================================
--- head/print/scribus-devel/files/patch-scribus_third__party_lib2geom_isnan.h
+++ head/print/scribus-devel/files/patch-scribus_third__party_lib2geom_isnan.h
@@ -0,0 +1,11 @@
+--- scribus/third_party/lib2geom/isnan.h.orig	2019-09-19 12:41:56 UTC
++++ scribus/third_party/lib2geom/isnan.h
+@@ -34,7 +34,7 @@
+ #elif defined(WIN32) || defined(_isnan)
+ # define is_nan(_a) (_isnan(_a)) 	/* Win32 definition */
+ #elif defined(isnan) || defined(__FreeBSD__)
+-# define is_nan(_a) (isnan(_a))		/* GNU definition */
++# define is_nan(_a) (std::isnan(_a))		/* GNU definition */
+ #else
+ # define is_nan(_a) (std::isnan(_a))
+ #endif