--- a/configure.cmake
+++ b/configure.cmake
@@ -1018,9 +1018,12 @@
 
 SET(CMAKE_EXTRA_INCLUDE_FILES) 
 
-CHECK_INCLUDE_FILE(ucontext.h HAVE_UCONTEXT_H)
-IF(NOT HAVE_UCONTEXT_H)
-  CHECK_INCLUDE_FILE(sys/ucontext.h HAVE_UCONTEXT_H)
+CHECK_INCLUDE_FILE(ucontext.h HAVE_UCONTEXT_HEADER)
+IF(NOT HAVE_UCONTEXT_HEADER)
+  CHECK_INCLUDE_FILE(sys/ucontext.h HAVE_UCONTEXT_HEADER)
+ENDIF()
+IF(HAVE_UCONTEXT_HEADER)
+  CHECK_FUNCTION_EXISTS(makecontext HAVE_UCONTEXT_H)
 ENDIF()
 
 CHECK_STRUCT_HAS_MEMBER("struct timespec" tv_sec "time.h" STRUCT_TIMESPEC_HAS_TV_SEC)