scenery: Make sure makeEffects has reader writer options.

[simgear.git] / CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 328dfdd0b791b4fd2e09a6bb5400956c840e1051..61824342e6ffec623172d8179871e676026d4775 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -232,6 +232,11 @@ check_cxx_source_compiles(
     void f() { isnan(0.0);} "
     HAVE_ISNAN)
 
+check_cxx_source_compiles(
+    "#include <cmath> 
+    void f() { std::isnan(0.0);} "
+    HAVE_STD_ISNAN)
+
 if(CMAKE_COMPILER_IS_GNUCXX)
     set(WARNING_FLAGS_CXX "-Wall")
     set(WARNING_FLAGS_C   "-Wall")