Fix path composition in packaging

CMakeLists.txt

@@ -52,6 +52,8 @@ if (BUILD_SHARED_LIBS)
     check_pie_supported()
 endif ()
 
+option(NetlibF2C_INCLUDE_PACKAGING "Include packaging rules for Netlib F2C" "${IS_TOP_LEVEL}")
+
 FetchContent_Declare(
     LoadStaticSharedTargets
     GIT_REPOSITORY "git@gitlab.aei.uni-hannover.de:cmake/loadstaticsharedtargets.git"
@@ -60,14 +62,12 @@ FetchContent_Declare(
     FIND_PACKAGE_ARGS 1.5.0 CONFIG NAMES LoadStaticSharedTargets
 )
 
-set(LoadStaticSharedTargets_INCLUDE_PACKAGING TRUE)
+set(LoadStaticSharedTargets_INCLUDE_PACKAGING "${NetlibF2C_INCLUDE_PACKAGING}")
 
 FetchContent_MakeAvailable(LoadStaticSharedTargets)
 
 add_subdirectory(src)
 
-option(NetlibF2C_INCLUDE_PACKAGING "Include packaging rules for Netlib F2C" "${IS_TOP_LEVEL}")
-
 if (NetlibF2C_INCLUDE_PACKAGING)
     add_subdirectory(packaging)
 endif ()

packaging/CMakeLists.txt

@@ -96,8 +96,8 @@ write_basic_package_version_file(
 
 file(READ "../cmake/HandlePolicies.cmake" HANDLE_POLICIES_SCRIPT OFFSET 1108)
 
-if (NOT LoadStaticSharedTargets_FOUND)
-    set(LoadStaticSharedTargets_DIR "${LoadStaticSharedTargets_INSTALL_CMAKEDIR}")
+if (DEFINED LoadStaticSharedTargets_SOURCE_DIR)
+    cmake_path(APPEND CMAKE_INSTALL_PREFIX "${LoadStaticSharedTargets_INSTALL_CMAKEDIR}" OUTPUT_VARIABLE LoadStaticSharedTargets_DIR)
 endif ()
 
 configure_file(
@@ -106,10 +106,6 @@ configure_file(
     @ONLY
 )
 
-if (NOT LoadStaticSharedTargets_FOUND)
-    unset(LoadStaticSharedTargets_DIR)
-endif ()
-
 install(
     FILES
     "${CMAKE_CURRENT_BINARY_DIR}/NetlibF2CConfigVersion.cmake"