fmt library added differently

CMakeLists.txt

@@ -12,7 +12,7 @@ include(DuneMacros)
 # start a dune project with information from dune.module
 dune_project()
 
-dune_enable_all_packages(MODULE_LIBRARIES amdis)
+dune_enable_all_packages(MODULE_LIBRARIES amdis fmt)
 
 add_subdirectory("src")
 add_subdirectory("test")
@@ -21,5 +21,7 @@ add_subdirectory("doc")
 add_subdirectory("cmake/modules")
 add_subdirectory("externals")
 
+target_link_libraries(amdis fmt)
+
 # finalize the dune project, e.g. generating config.h etc.
 finalize_dune_project(GENERATE_CONFIG_H_CMAKE)

externals/CMakeLists.txt

-target_include_directories(amdis PUBLIC
-  $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/externals/fmt/include>)
-
-dune_library_add_sources(amdis SOURCES
+dune_library_add_sources(fmt SOURCES
   fmt/src/format.cc
-  fmt/src/posix.cc)
+  fmt/src/posix.cc
+)
+
+target_include_directories(fmt PUBLIC
+  $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/externals/fmt/include>)
 
 install(FILES
   fmt/include/fmt/core.h