diff --git a/tests/Makefile b/tests/Makefile
new file mode 100644
index 0000000..18bad73
--- /dev/null
+++ b/tests/Makefile
@@ -0,0 +1,10 @@
+.PHONY: clean-c_binding c_binding
+
+all: c_binding
+clean: clean-c_binding
+
+c_binding:
+	$(MAKE) -C $@
+
+clean-c_binding:
+	$(MAKE) -C $(subst clean-,,$@) clean
diff --git a/tests/c_binding/Makefile b/tests/c_binding/Makefile
new file mode 100644
index 0000000..10db7b2
--- /dev/null
+++ b/tests/c_binding/Makefile
@@ -0,0 +1,13 @@
+.PHONY: pi
+
+all: calc.out
+	echo '3.141592653589793' | cmp - calc.out
+
+calc.out: calc
+	./calc 'pi' | tee calc.out
+
+calc: calc.c calc.pl
+	swipl-ld -o calc calc.c calc.pl
+
+clean:
+	rm -f calc calc.out
diff --git a/tests/c_binding/calc.c b/tests/c_binding/calc.c
new file mode 100644
index 0000000..27390b9
--- /dev/null
+++ b/tests/c_binding/calc.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <SWI-Prolog.h>
+
+#define MAXLINE 1024
+
+int
+main(int argc, char **argv)
+{ char expression[MAXLINE];
+  char *e = expression;
+  char *program = argv[0];
+  char *plav[2];
+  int n;
+
+  /* combine all the arguments in a single string */
+
+  for(n=1; n<argc; n++)
+  { if ( n != 1 )
+      *e++ = ' ';
+    strcpy(e, argv[n]);
+    e += strlen(e);
+  }
+
+  /* make the argument vector for Prolog */
+
+  plav[0] = program;
+  plav[1] = NULL;
+
+  /* initialise Prolog */
+
+  if ( !PL_initialise(1, plav) )
+    PL_halt(1);
+
+  /* Lookup calc/1 and make the arguments and call */
+
+  { predicate_t pred = PL_predicate("calc", 1, "user");
+    term_t h0 = PL_new_term_refs(1);
+    int rval;
+
+    PL_put_atom_chars(h0, expression);
+    rval = PL_call_predicate(NULL, PL_Q_NORMAL, pred, h0);
+
+    PL_halt(rval ? 0 : 1);
+  }
+
+  return 0;
+}
diff --git a/tests/c_binding/calc.pl b/tests/c_binding/calc.pl
new file mode 100644
index 0000000..b5e6ca9
--- /dev/null
+++ b/tests/c_binding/calc.pl
@@ -0,0 +1,5 @@
+calc(Atom) :-
+        term_to_atom(Expr, Atom),
+        A is Expr,
+        write(A),
+        nl.