diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,6 +32,9 @@
   SET(HAVE_GLPK TRUE)
 ENDIF(GLPK_FOUND)
 
+INCLUDE(CheckTypeSize)
+CHECK_TYPE_SIZE("long long" LONG_LONG)
+
 ENABLE_TESTING()
 
 ADD_SUBDIRECTORY(lemon)