add openmp include dir flag

- cmake/GetSNAP.cmake: add include directory flag for SNAP CXXFLAGS.
- list of flags to split over multiple lines and then join into one string.

Signed-off-by: Aiden Woodruff <woodra@rpi.edu>

1 files changed, 6 insertions, 1 deletions

diff --git a/cmake/GetSNAP.cmake b/cmake/GetSNAP.cmake
index 5ff6293..f19a9be 100644
--- a/cmake/GetSNAP.cmake
+++ b/cmake/GetSNAP.cmake
@@ -27,7 +27,12 @@ else()
         endif()
 endif()
 
-set(SNAP_CXX_FLAGS "${SNAP_ARCH_FLAG} ${SNAP_POLL_FLAG} ${OpenMP_CXX_FLAGS}")
+set(SNAP_CXX_FLAGS_
+        "${SNAP_ARCH_FLAG}"
+        "${SNAP_POLL_FLAG}"
+        "${OpenMP_CXX_FLAGS} -I${OpenMP_CXX_INCLUDE_DIR}"
+)
+list(JOIN SNAP_CXX_FLAGS_ " " SNAP_CXX_FLAGS)
 
 include(ExternalProject)
 ExternalProject_Add(