diff --git a/src/Reactor/LLVMReactor.cpp b/src/Reactor/LLVMReactor.cpp
index 2069a77..fc9f5e9 100644
--- a/src/Reactor/LLVMReactor.cpp
+++ b/src/Reactor/LLVMReactor.cpp
@@ -452,6 +452,12 @@
 
 namespace rr
 {
+	const Capabilities Caps =
+	{
+		true, // CallSupported
+	};
+
+
 #if REACTOR_LLVM_VERSION < 7
 	class LLVMReactorJIT
 	{
diff --git a/src/Reactor/Reactor.hpp b/src/Reactor/Reactor.hpp
index 7846711..e6f3ff2 100644
--- a/src/Reactor/Reactor.hpp
+++ b/src/Reactor/Reactor.hpp
@@ -34,6 +34,12 @@
 
 namespace rr
 {
+	struct Capabilities
+	{
+		bool CallSupported; // Support for rr::Call()
+	};
+	extern const Capabilities Caps;
+
 	class Bool;
 	class Byte;
 	class SByte;
diff --git a/src/Reactor/SubzeroReactor.cpp b/src/Reactor/SubzeroReactor.cpp
index 63d7bd6..c30a419 100644
--- a/src/Reactor/SubzeroReactor.cpp
+++ b/src/Reactor/SubzeroReactor.cpp
@@ -133,6 +133,11 @@
 
 namespace rr
 {
+	const Capabilities Caps =
+	{
+		false, // CallSupported
+	};
+
 	enum EmulatedType
 	{
 		EmulatedShift = 16,