--- backend/CMakeLists.txt.orig	2011-03-30 15:13:56.000000000 +0800
+++ backend/CMakeLists.txt	2011-03-30 15:14:34.000000000 +0800
@@ -2,7 +2,8 @@
 
 project(zint)
 
-find_package(PNG)
+find_package(PNG REQUIRED)
+include_directories(${PNG_INCLUDE_DIR})
 
 set(zint_COMMON_SRCS common.c library.c render.c ps.c large.c reedsol.c gs1.c svg.c png.c)
 set(zint_ONEDIM_SRCS code.c code128.c 2of5.c upcean.c telepen.c medical.c plessey.c rss.c)
@@ -21,7 +22,7 @@ add_library(zint SHARED ${zint_SRCS})
 set_target_properties(zint PROPERTIES 	SOVERSION "${ZINT_VERSION_MAJOR}.${ZINT_VERSION_MINOR}"
 					VERSION ${ZINT_VERSION})
 
-target_link_libraries(zint ${PNG_LIBRARIES} )
+target_link_libraries(zint ${PNG_LIBRARY} )
 target_link_libraries(zint -lm)
 
 install(TARGETS zint  ${INSTALL_TARGETS_DEFAULT_ARGS} )