diff --git a/exposed/DOC.txt b/exposed/DOC.txt
index 0d887d71..4ba2547c 100644
--- a/exposed/DOC.txt
+++ b/exposed/DOC.txt
@@ -229,7 +229,7 @@ SLVS_E_ARC_OF_CIRCLE
     It is then defined by three points
 
         point[0]        center of the circle
-        point[1]        begining of the arc
+        point[1]        beginning of the arc
         point[2]        end of the arc
 
     and its normal
@@ -237,7 +237,7 @@ SLVS_E_ARC_OF_CIRCLE
         normal          identical to the normal of the workplane
 
     The arc runs counter-clockwise from its beginning to its end (with
-    the workplane's normal pointing owards the viewer). If the begining
+    the workplane's normal pointing towards the viewer). If the beginning
     and end of the arc are coincident, then the arc is considered to
     represent a full circle.
 
diff --git a/exposed/lib.cpp b/exposed/lib.cpp
index 8b3206b6..560cf878 100644
--- a/exposed/lib.cpp
+++ b/exposed/lib.cpp
@@ -10,6 +10,10 @@ void Group::GenerateEquations(IdList<Equation,hEquation> *l) {
     // Nothing to do for now.
 }
 
+void DoMessageBox(char *str, int rows, int cols, BOOL error)
+{
+}
+
 extern "C" {
 
 void Slvs_QuaternionU(double qw, double qx, double qy, double qz,