Better handle missing opencv

CMakeLists.txt

@@ -18,7 +18,8 @@ armarx_project("RobotAPI")
 depends_on_armarx_package(ArmarXGui)
 
 find_package(DMP QUIET)
-
+find_package(OpenCV QUIET)
+find_package(IVT COMPONENTS ivt ivtopencv QUIET)
 
 add_subdirectory(source)
 

source/RobotAPI/libraries/armem/server/CMakeLists.txt

@@ -12,6 +12,7 @@ armarx_build_if(libmongocxx_FOUND "libmongocxx not available. ${INSTALL_SCRIPT_M
 find_package(libbsoncxx QUIET)
 armarx_build_if(libbsoncxx_FOUND "libbsoncxx not available. ${INSTALL_SCRIPT_MSG}")
 
+armarx_build_if(OpenCV_FOUND "OpenCV not available")
 
 set(LIBS
     ArmarXCoreInterfaces

source/RobotAPI/libraries/aron/converter/ivt/CMakeLists.txt

@@ -3,8 +3,8 @@ set(LIB_NAME aronivtconverter)
 armarx_component_set_name("${LIB_NAME}")
 armarx_set_target("Library: ${LIB_NAME}")
 
-find_package(IVT COMPONENTS ivt ivtopencv QUIET)
 armarx_build_if(IVT_FOUND "IVT not available")
+armarx_build_if(OpenCV_FOUND "OpenCV not available")
 
 set(LIBS
     aron 

source/RobotAPI/libraries/aron/converter/opencv/CMakeLists.txt

@@ -3,7 +3,6 @@ set(LIB_NAME aronopencvconverter)
 armarx_component_set_name("${LIB_NAME}")
 armarx_set_target("Library: ${LIB_NAME}")
 
-find_package(OpenCV QUIET)
 armarx_build_if(OpenCV_FOUND "OpenCV not available")
 
 set(LIBS