diff --git a/setup.py b/setup.py
index fba44d4..0a36bcf 100644
--- a/setup.py
+++ b/setup.py
@@ -49,12 +49,16 @@ try:
 except AttributeError:
     numpy_include = numpy.get_numpy_include()
 
+try:
+    pil_include = os.environ['PIL_INCLUDE_DIR'].split(os.pathsep)
+except:
+    pil_include = []
 
 c_overviewer_files = ['src/main.c', 'src/composite.c', 'src/iterate.c', 'src/endian.c']
 c_overviewer_files += ['src/rendermodes.c', 'src/rendermode-normal.c', 'src/rendermode-lighting.c', 'src/rendermode-night.c', 'src/rendermode-spawn.c']
 c_overviewer_files += ['src/Draw.c']
 c_overviewer_includes = ['src/overviewer.h', 'src/rendermodes.h']
-setup_kwargs['ext_modules'].append(Extension('c_overviewer', c_overviewer_files, include_dirs=['.', numpy_include], depends=c_overviewer_includes, extra_link_args=[]))
+setup_kwargs['ext_modules'].append(Extension('c_overviewer', c_overviewer_files, include_dirs=['.', numpy_include] + pil_include, depends=c_overviewer_includes, extra_link_args=[]))
 # tell build_ext to build the extension in-place
 # (NOT in build/)
 setup_kwargs['options']['build_ext'] = {'inplace' : 1}