diff --git a/src/common-opencl.c b/src/common-opencl.c
index 44a124b..f18e583 100644
--- a/src/common-opencl.c
+++ b/src/common-opencl.c
@@ -84,6 +84,14 @@
 	HANDLE_CLERROR(ret_code, "Error creating command queue");
 }
 
+static char * include_source(char *pathname)
+{
+	char *include[PATH_BUFFER_SIZE];
+        sprintf(include, "-I %s", path_expand(pathname));        
+        
+        return include;
+}
+
 
 static void build_kernel(int dev_id)
 {
@@ -95,7 +103,8 @@
 	HANDLE_CLERROR(ret_code, "Error while creating program");
 
 	cl_int build_code;
-	build_code = clBuildProgram(program[dev_id], 0, NULL, "", NULL, NULL);
+	build_code = clBuildProgram(program[dev_id], 0, NULL, 
+                include_source("$JOHN/"), NULL, NULL);
 
 	HANDLE_CLERROR(clGetProgramBuildInfo(program[dev_id], devices[dev_id],
 		CL_PROGRAM_BUILD_LOG, sizeof(opencl_log), (void *) opencl_log,