diff --git a/generators/image.h b/generators/image.h
index 2013f2f..3a50da0 100644
--- a/generators/image.h
+++ b/generators/image.h
@@ -11,7 +11,7 @@ pixel[1] = header_data_cmap[(unsigned char)data[0]][1]; \
 pixel[2] = header_data_cmap[(unsigned char)data[0]][2]; \
 data ++; }
 
-static char header_data_cmap[256][3] = {
+static unsigned char header_data_cmap[256][3] = {
 	{  0,  0,  0},
 	{255,255,255},
 	{255,255,255},
diff --git a/generators/realWorld.cpp b/generators/realWorld.cpp
index 1df4a96..da61c15 100644
--- a/generators/realWorld.cpp
+++ b/generators/realWorld.cpp
@@ -3,10 +3,10 @@
 #include "image.h"
 
 // windows MinGW
-// g++ -shared realWorld.cpp -o realWorld.dll -I../include
+// g++ -shared realWorld.cpp -o realWorld.dll -I../src -funsigned-char -std=c++11
 
 // linux gcc
-// g++ -shared realWorld.cpp -o realWorld.so -I../include -fPIC
+// g++ -shared realWorld.cpp -o realWorld.so -I../src -fPIC -funsigned-char -std=c++11
 
 extern "C" void generate(Map *mapPtr)
 {