CHECK_FUNCTION_EXISTS(makecontext HAVE_MAKECONTEXT)
CHECK_FUNCTION_EXISTS(mmap HAVE_MMAP)
+# Our usage of mmap is Linux-specific (flag MAP_ANONYMOUS), but kFreeBSD uses a GNU libc
+IF(NOT "${CMAKE_SYSTEM}" MATCHES "Linux" AND NOT "${CMAKE_SYSTEM}" MATCHES "kFreeBSD")
+ SET(HAVE_MMAP 0)
+ENDIF(NOT "${CMAKE_SYSTEM}" MATCHES "Linux" AND NOT "${CMAKE_SYSTEM}" MATCHES "kFreeBSD")
+
if(WIN32) #THOSE FILES ARE FUNCTIONS ARE NOT DETECTED BUT THEY SHOULD...
set(HAVE_UCONTEXT_H 1)
set(HAVE_MAKECONTEXT 1)