[CMake] string(TOUPPER ...) problems

[ope]

Hi,

I get the error

CMake Error: Error in cmake code at
.../CMakeLists.txt:295:
STRING no output variable specified

by this peace of code:


set (requiredPackages
  ZLIB
  BZip2
  XercesC
  CURL
  Log4cxx
)

foreach (package ${requiredPackages})
  find_package(${package} REQUIRED)
  include_directories(${${package}_INCLUDE_DIRS})
  string(TOUPPER ${${package}_LIBRARIES} PACKAGE_LIBRARIES)
  link_directories(${PACKAGE_LIBRARIES})
  target_link_libraries(${app_name} ${PACKAGE_LIBRARIES})
endforeach()

Imo there is an output variable of course. Anyway, I have to work around
the upper/lower case depencies from FindXXX naming ...

How to solve this?

Thanks
Olaf