--- tesseract-3.04.00/opencl/openclwrapper.cpp.orig     2016-01-31 11:55:02.535154846 +0100
+++ tesseract-3.04.00/opencl/openclwrapper.cpp  2016-01-31 12:04:23.727809089 +0100
@@ -14,6 +14,21 @@
 #include "otsuthr.h"
 #include "thresholder.h"
 
+/*
+    Convenience macro to test the version of Leptonica.
+*/
+#if defined(LIBLEPT_MAJOR_VERSION) && defined(LIBLEPT_MINOR_VERSION)
+#   define TESSERACT_LIBLEPT_PREREQ(maj, min) \
+        ((LIBLEPT_MAJOR_VERSION) > (maj) || ((LIBLEPT_MAJOR_VERSION) == (maj) && (LIBLEPT_MINOR_VERSION) >= (min)))
+#else
+#   define TESSERACT_LIBLEPT_PREREQ(maj, min) 0
+#endif
+
+#if TESSERACT_LIBLEPT_PREREQ(1,73)
+#   define CALLOC LEPT_CALLOC
+#   define FREE LEPT_FREE
+#endif
+
 #ifdef USE_OPENCL
 
 #if ON_APPLE