Fix compilation error on Linux

diff --git a/src/SketchSolver/SketchSolver.h b/src/SketchSolver/SketchSolver.h
index c6387dd4724c8195bd834506283241b691b2b32c..56fa1dba25eba093e0041f1de7595e83b29080ee 100644 (file)
--- a/src/SketchSolver/SketchSolver.h
+++ b/src/SketchSolver/SketchSolver.h
@@ -3,6 +3,8 @@
 #ifndef SKETCHSOLVER_H
 #define SKETCHSOLVER_H
 
+#include <stdlib.h>
+
 #if defined SKETCHSOLVER_EXPORTS
 #if defined WIN32
 #define SKETCHSOLVER_EXPORT              __declspec( dllexport )