diff --git a/src/ccall.h b/src/ccall.h
new file mode 100644
index 0000000..4a1d5bb
--- /dev/null
+++ b/src/ccall.h
@@ -0,0 +1,20 @@
+#ifndef _CCALL_H
+#define _CCALL_H
+
+/*
+  Extern C-CALL API
+  C functioncs can be registered and called via plx (CCALL).
+*/
+typedef struct {
+  char* name;
+  int  (*foo)();
+  int8_t nargs; // -1: varargs, top of stack contains nargs
+  int8_t nret;
+  index_t next; // index of next first character group  
+} ccall_t;
+
+extern ccall_t *ccalls;
+
+void CCallInit(ccall_t *_ccalls);
+
+#endif