--- src/Common/CommonFunctions.cpp.orig	2019-06-09 12:18:38.000000000 -0700
+++ src/Common/CommonFunctions.cpp	2019-06-16 07:36:50.000000000 -0700
@@ -54,7 +54,9 @@
 #include <Common/LuminanceOptions.h>
 
 #include <boost/algorithm/minmax_element.hpp>
+#ifdef _OPENMP
 #include <omp.h>
+#endif
 
 using namespace std;
 using namespace pfs;