$OpenBSD$

Index: ThirdParty/mpi4py/vtkmpi4py/src/python.c
--- ThirdParty/mpi4py/vtkmpi4py/src/python.c.orig
+++ ThirdParty/mpi4py/vtkmpi4py/src/python.c
@@ -9,7 +9,7 @@
 #define OMPI_IGNORE_CXX_SEEK 1
 #include <mpi.h>
 
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
 #include <floatingpoint.h>
 #endif
 
@@ -24,7 +24,7 @@ static int Py3_Main(int, char **);
 int
 main(int argc, char **argv)
 {
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
   fp_except_t m;
   m = fpgetmask();
   fpsetmask(m & ~FP_X_OFL);
