--- src/SeExpr2/CMakeLists.txt.orig	2019-10-03 17:15:38 UTC
+++ src/SeExpr2/CMakeLists.txt
@@ -19,6 +19,10 @@ file(GLOB to_remove "ExprLLVMCodeGeneration.cpp")
 list(REMOVE_ITEM io_cpp ${to_remove})
 
 set_source_files_properties("ExprBuiltins.cpp" PROPERTIES COMPILE_DEFINITIONS "__STDC_LIMIT_MACROS")
+# XXX: avoid undefref to llvm::cfg::Update<llvm::BasicBlock*>::dump() const
+set_source_files_properties(
+    Expression.cpp ExprLLVMCodeGeneration.cpp
+    PROPERTIES COMPILE_DEFINITIONS NDEBUG)
 
 # Uncomment below to print debug messages / performance stats
 #add_definitions(-DSEEXPR_DEBUG)