+## We need a decent support of the c++11 standard
+include(CheckCXXCompilerFlag)
+CHECK_CXX_COMPILER_FLAG("-std=gnu++11" COMPILER_SUPPORTS_CXX11)
+if(COMPILER_SUPPORTS_CXX11)
+ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
+else()
+ message(FATAL_ERROR
+ "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. "
+ "Please use a decent C++ compiler.")
+endif()
+
+### And we need C11 standard, too
+include(CheckCCompilerFlag)
+CHECK_C_COMPILER_FLAG("-std=gnu11" COMPILER_SUPPORTS_C11)
+if(COMPILER_SUPPORTS_C11)
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11")
+else()
+ message(FATAL_ERROR
+ "The compiler ${CMAKE_C_COMPILER} has no C11 support. "
+ "Please use a decent C compiler "
+ "(note that c++11 support of ${CMAKE_CXX_COMPILER} seems ok).")
+endif()
+if(APPLE AND ("4.6" GREATER COMPILER_C_VERSION_MAJOR_MINOR))
+ ### gcc 4.[1-5] cannot compile ucontext on OSX
+ message(STATUS "Ucontext can't be used with this version of gcc (must be greater than 4.5)")
+ set(HAVE_UCONTEXT_H 0)
+endif()
+
+
+### SMPI vs. Fortran
+if ((NOT DEFINED enable_smpi OR enable_smpi) AND NOT APPLE) # smpi is enabled by default