Specify required versions of dependencies, emit own version file.

CMakeLists.txt

@@ -22,8 +22,8 @@ option(IRLBA_FETCH_EXTERN "Automatically fetch CppIrlba's dependencies." ON)
 if(IRLBA_FETCH_EXTERN)
     add_subdirectory(extern)
 else()
-    find_package(Eigen3 CONFIG REQUIRED)
-    find_package(ltla_aarand CONFIG REQUIRED)
+    find_package(Eigen3 3.4.0 CONFIG REQUIRED)
+    find_package(ltla_aarand 1.0.0 CONFIG REQUIRED)
 endif()
 
 target_link_libraries(irlba INTERFACE Eigen3::Eigen ltla::aarand)
@@ -57,5 +57,10 @@ configure_package_config_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/Config.cmake.in
     "${CMAKE_CURRENT_BINARY_DIR}/ltla_irlbaConfig.cmake"
     INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/ltla_irlba)
 
+write_basic_package_version_file(
+    "${CMAKE_CURRENT_BINARY_DIR}/ltla_irlbaConfigVersion.cmake"
+    COMPATIBILITY SameMajorVersion)
+
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/ltla_irlbaConfig.cmake"
+    "${CMAKE_CURRENT_BINARY_DIR}/ltla_irlbaConfigVersion.cmake"
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/ltla_irlba)

cmake/Config.cmake.in

@@ -1,7 +1,7 @@
 @PACKAGE_INIT@
 
 include(CMakeFindDependencyMacro)
-find_dependency(Eigen3 CONFIG REQUIRED)
-find_dependency(ltla_aarand CONFIG REQUIRED)
+find_dependency(Eigen3 3.4.0 CONFIG REQUIRED)
+find_dependency(ltla_aarand 1.0.0 CONFIG REQUIRED)
 
 include("${CMAKE_CURRENT_LIST_DIR}/ltla_irlbaTargets.cmake")

extern/CMakeLists.txt

@@ -13,7 +13,7 @@ FetchContent_MakeAvailable(eigen)
 FetchContent_Declare(
   aarand
   GIT_REPOSITORY https://github.com/LTLA/aarand
-  GIT_TAG 84d48b65d49ce8b844398f11aff3015b86e17197
+  GIT_TAG master # ^1.0.0
 )
 
 FetchContent_MakeAvailable(aarand)