--- CMakeLists.txt.orig	2014-01-14 12:39:39.038297528 +0400
+++ CMakeLists.txt	2014-01-14 12:41:03.052304850 +0400
@@ -134,43 +134,13 @@
 endif (HAVE_EXIV2_HPP)
 
 #webp
-SET(WEBP_INCLUDE_DIR "")
-SET(WEBP_SOURCE "")
 IF(ENABLE_WEBP)
-	ADD_DEFINITIONS(-DNDEBUG -DWEBP_USE_THREAD)
-
-	FILE(GLOB WEBP_DEC_SRCS
-		RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
-		${CMAKE_CURRENT_SOURCE_DIR}/libwebp/src/dec/*c
-	)
-	
-	FILE(GLOB WEBP_DEMUX_SRCS
-		RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
-		${CMAKE_CURRENT_SOURCE_DIR}/libwebp/src/demux/*c
-	)
-
-	FILE(GLOB WEBP_DSP_SRCS
-		RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
-		${CMAKE_CURRENT_SOURCE_DIR}/libwebp/src/dsp/*c
-	)
-
-	FILE(GLOB WEBP_ENC_SRCS
-		RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
-		${CMAKE_CURRENT_SOURCE_DIR}/libwebp/src/enc/*c
-	)
-
-	FILE(GLOB WEBP_UTILS_SRCS
-		RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
-		${CMAKE_CURRENT_SOURCE_DIR}/libwebp/src/utils/*c
-	)
-
-	FILE(GLOB WEBP_MUX_SRCS
-		RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
-		${CMAKE_CURRENT_SOURCE_DIR}/libwebp/src/mux/*c
-	)
-	SET(WEBP_SOURCE ${WEBP_DEC_SRCS} ${WEBP_DEMUX_SRCS} ${WEBP_DSP_SRCS} ${WEBP_ENC_SRCS} ${WEBP_UTILS_SRCS} ${WEBP_MUX_SRC})
-	SET(WEBP_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/libwebp/src)
-	add_definitions(-DWITH_WEBP)
+	pkg_check_modules(WEBP libwebp)
+	IF(WEBP_FOUND)
+		add_definitions(-DWITH_WEBP)
+	ELSE(WEBP_FOUND)
+		message(FATAL_ERROR "libwebp was not found. It's mandatory when used with ENABLE_WEBP enabled.")
+	ENDIF(WEBP_FOUND)
 ENDIF(ENABLE_WEBP)
 
 
@@ -439,9 +409,9 @@
 				
 	ELSE()
 		set(EXE_NAME ${CMAKE_PROJECT_NAME})
-		link_directories(${LIBRAW_LIBRARY_DIRS} ${OpenCV_LIBRARY_DIRS} ${EXIV2_LIBRARY_DIRS})
-		add_executable(${EXE_NAME} WIN32 MACOSX_BUNDLE ${NOMACS_SOURCES} ${NOMACS_UI} ${NOMACS_MOC_SRC} ${NOMACS_RCC} ${NOMACS_HEADERS} ${NOMACS_RC} ${NOMACS_QM} ${NOMACS_TRANSLATIONS} ${LIBQPSD_SOURCES} ${LIBQPSD_HEADERS} ${LIBQPSD_MOC_SRC} ${WEBP_SOURCE})
-		target_link_libraries(${EXE_NAME} ${QT_QTCORE_LIBRARY} ${QT_QTGUI_LIBRARY} ${QT_QTNETWORK_LIBRARY} ${QT_QTMAIN_LIBRARY} ${EXIV2_LIBRARIES} ${LIBRAW_LIBRARIES} ${OpenCV_LIBS} ${VERSION_LIB} ${TIFF_LIBRARIES})
+		link_directories(${LIBRAW_LIBRARY_DIRS} ${OpenCV_LIBRARY_DIRS} ${EXIV2_LIBRARY_DIRS} ${WEBP_LIBRARY_DIRS})
+		add_executable(${EXE_NAME} WIN32 MACOSX_BUNDLE ${NOMACS_SOURCES} ${NOMACS_UI} ${NOMACS_MOC_SRC} ${NOMACS_RCC} ${NOMACS_HEADERS} ${NOMACS_RC} ${NOMACS_QM} ${NOMACS_TRANSLATIONS} ${LIBQPSD_SOURCES} ${LIBQPSD_HEADERS} ${LIBQPSD_MOC_SRC})
+		target_link_libraries(${EXE_NAME} ${QT_QTCORE_LIBRARY} ${QT_QTGUI_LIBRARY} ${QT_QTNETWORK_LIBRARY} ${QT_QTMAIN_LIBRARY} ${EXIV2_LIBRARIES} ${LIBRAW_LIBRARIES} ${OpenCV_LIBS} ${VERSION_LIB} ${TIFF_LIBRARIES} ${WEBP_LIBRARIES})
 
 		IF (CMAKE_SYSTEM_NAME MATCHES "Linux")
 			SET_TARGET_PROPERTIES(${EXE_NAME} PROPERTIES LINK_FLAGS -fopenmp)
--- CMakeLists.txt.orig	2014-01-14 12:57:49.174392532 +0400
+++ CMakeLists.txt	2014-01-14 12:58:02.554393698 +0400
@@ -276,7 +276,7 @@
 	${OpenCV_INCLUDE_DIRS}
 	${CMAKE_CURRENT_BINARY_DIR}
 	${CMAKE_SOURCE_DIR}/src
-	${WEBP_INCLUDE_DIR}
+	${WEBP_INCLUDE_DIRS}
 	${TIFF_INCLUDE_DIR}
 	${TIFF_CONFIG_DIR}
 )