--- a/SConstruct	2010-06-07 07:30:41.000000000 -0400
+++ b/SConstruct	2010-08-10 20:21:01.534302997 -0400
@@ -61,7 +61,8 @@
 
 assert conf.CheckLibWithHeader('png', 'png.h', 'C', 'png_byte;', 1),"please install: libpng12-dev"
 assert conf.CheckLibWithHeader('jpeg', 'jconfig.h', 'C', 'jpeg_std_error();', 1),"please install: libjpeg62-dev"    
-assert conf.CheckLibWithHeader('tiff', 'tiff.h', 'C', 'inflate();', 1), "please install: libtiff4-dev"
+assert conf.CheckLibWithHeader('z', 'zlib.h', 'C', 'inflate;', 1), "please install: zlib"
+assert conf.CheckLibWithHeader('tiff', 'tiff.h', 'C', 'TIFFOpen();', 1), "please install: libtiff4-dev"
 
 ### check for optional parts