Support using build trees in addition to installation trees. No need

to install modules anymore.

[[Imported from SVN: r1578]]

DuneIstlConfig.cmake.in

-#compute installation prefix relative to this file
-get_filename_component(_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)
-get_filename_component(_prefix "${_dir}/../.." ABSOLUTE)
 
 #import the target
-#include("${_prefix}/lib/cmake/@DUNE_MOD_NAME_CMAKE@Targets.cmake")
+#include("@CMAKE_BINARY_DIR@/@DUNE_MOD_NAME_CMAKE@Targets.cmake")
 
 #report other information
-set(@DUNE_MOD_NAME_CMAKE@_INCLUDE_DIRS "${_prefix}/include")
+set(@DUNE_MOD_NAME_CMAKE@_PREFIX "@CMAKE_SOURCE_DIR@")
+set(@DUNE_MOD_NAME_CMAKE@_INCLUDE_DIRS "@CMAKE_SOURCE_DIR@")
 set(@DUNE_MOD_NAME_CMAKE@_CXX_FLAGS "@CMAKE_CXX_FLAGS@")
 set(@DUNE_MOD_NAME_CMAKE@_CXX_FLAGS_DEBUG "@CMAKE_CXX_FLAGS_DEBUG@")
 set(@DUNE_MOD_NAME_CMAKE@_CXX_FLAGS_MINSIZEREL "@CMAKE_CXX_FLAGS_MINSIZEREL@")
 set(@DUNE_MOD_NAME_CMAKE@_CXX_FLAGS_RELEASE "@CMAKE_CXX_FLAGS_RELEASE@")
 set(@DUNE_MOD_NAME_CMAKE@_CXX_FLAGS_RELWITHDEBINFO "@CMAKE_CXX_FLAGS_RELWITHDEBINFO@")
+set(@DUNE_MOD_NAME_CMAKE@_LIBRARIES "")

cmake/pkg/DuneIstlConfig.cmake.in

+#compute installation prefix relative to this file
+get_filename_component(_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)
+get_filename_component(_prefix "${_dir}/../.." ABSOLUTE)
+
+#import the target
+#include("${_prefix}/lib/cmake/@DUNE_MOD_NAME_CMAKE@Targets.cmake")
+
+#report other information
+set(@DUNE_MOD_NAME_CMAKE@_INCLUDE_DIRS "${_prefix}/include")
+set(@DUNE_MOD_NAME_CMAKE@_CXX_FLAGS "@CMAKE_CXX_FLAGS@")
+set(@DUNE_MOD_NAME_CMAKE@_CXX_FLAGS_DEBUG "@CMAKE_CXX_FLAGS_DEBUG@")
+set(@DUNE_MOD_NAME_CMAKE@_CXX_FLAGS_MINSIZEREL "@CMAKE_CXX_FLAGS_MINSIZEREL@")
+set(@DUNE_MOD_NAME_CMAKE@_CXX_FLAGS_RELEASE "@CMAKE_CXX_FLAGS_RELEASE@")
+set(@DUNE_MOD_NAME_CMAKE@_CXX_FLAGS_RELWITHDEBINFO "@CMAKE_CXX_FLAGS_RELWITHDEBINFO@")