$NetBSD$

* Don't force program that use rtmidi to use find_package(Threads)
  it comes with the so and the public headers don't include pthread.h

* Define GNUIInstallDirs varibles before they are used and remove
  over inclusion of GNUInstallDirs

* Give cmake package files correct names so that they can be found by cmake 

--- CMakeLists.txt.orig	2021-11-16 17:19:37.000000000 +0000
+++ CMakeLists.txt
@@ -156,7 +156,7 @@ if (NEED_PTHREAD)
   find_package(Threads REQUIRED
     CMAKE_THREAD_PREFER_PTHREAD
     THREADS_PREFER_PTHREAD_FLAG)
-  list(APPEND PUBLICLINKLIBS Threads::Threads)
+  list(APPEND LINKLIBS Threads::Threads)
 endif()
 
 # Create library targets.
@@ -187,11 +187,14 @@ set_target_properties(rtmidi PROPERTIES
   SOVERSION ${SO_VER}
   VERSION ${FULL_VER})
 
+# Set standard installation directories.
+include(GNUInstallDirs)
+
 # Set include paths, populate target interface.
 target_include_directories(rtmidi PRIVATE ${INCDIRS}
                                   PUBLIC
                                     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
-                                    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
+                                    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/rtmidi>)
 
 # Set compile-time definitions
 target_compile_definitions(rtmidi PRIVATE ${API_DEFS})
@@ -199,9 +202,6 @@ target_compile_definitions(rtmidi PRIVAT
 target_link_libraries(rtmidi PUBLIC ${PUBLICLINKLIBS} 
                              PRIVATE ${LINKLIBS})
 
-# Set standard installation directories.
-include(GNUInstallDirs)
-
 # Add tests if requested.
 option(RTMIDI_BUILD_TESTING "Build test programs" ON)
 if (NOT DEFINED RTMIDI_BUILD_TESTING OR RTMIDI_BUILD_TESTING STREQUAL "")
@@ -225,9 +225,6 @@ if (RTMIDI_BUILD_TESTING)
   add_test(NAME apinames COMMAND apinames)
 endif()
 
-# Set standard installation directories.
-include(GNUInstallDirs)
-
 # Message
 string(REPLACE ";" " " apilist "${API_LIST}")
 message(STATUS "Compiling with support for: ${apilist}")
@@ -280,7 +277,7 @@ include(CMakePackageConfigHelpers)
 
 # Write cmake package version file
 write_basic_package_version_file(
-    RtMidi-config-version.cmake
+    rtmidi-config-version.cmake
     VERSION ${FULL_VER}
     COMPATIBILITY SameMajorVersion
 )
@@ -288,15 +285,15 @@ write_basic_package_version_file(
 # Write cmake package config file
 configure_package_config_file (
     cmake/RtMidi-config.cmake.in
-    RtMidi-config.cmake
+    rtmidi-config.cmake
     INSTALL_DESTINATION "${RTMIDI_CMAKE_DESTINATION}"
 )
 
 # Install package files
 install (
     FILES
-        "${CMAKE_CURRENT_BINARY_DIR}/RtMidi-config.cmake"
-        "${CMAKE_CURRENT_BINARY_DIR}/RtMidi-config-version.cmake"
+        "${CMAKE_CURRENT_BINARY_DIR}/rtmidi-config.cmake"
+        "${CMAKE_CURRENT_BINARY_DIR}/rtmidi-config-version.cmake"
     DESTINATION
         "${RTMIDI_CMAKE_DESTINATION}"
 )