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     | 
    
      --- a/cpp/dolfinx/CMakeLists.txt
+++ b/cpp/dolfinx/CMakeLists.txt
@@ -324,6 +324,10 @@
 string(REPLACE ";" " " PKG_CXXFLAGS "${CMAKE_CXX_FLAGS}")
 string(REPLACE ";" " " PKG_LINKFLAGS "${CMAKE_EXE_LINKER_FLAGS}")
 
+# DOLFINX_EXTRA_CXX_FLAGS are used for the build (by adding to CMAKE_CXX_FLAGS)
+# but should not be included in the pkgconfig file (i.e. don't add to PKG_CXXFLAGS above)
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${DOLFINX_EXTRA_CXX_FLAGS}")
+
 # Convert libraries to -L<libdir> -l<lib> form
 foreach(_lib ${PKGCONFIG_DOLFINX_LIBS})
   # Add -Wl,option directives
 
     |