fixes and simplifications

* FluidSynthConfigVersion.cmake is created with ${VERSION} instead of
${LIB_VERSION_INFO}
* FluidSynthConfig.cmake.in simplified: it doesn't need to include the
version file.
* Simplified BUILD_INTERFACE generator expression as suggested

CMakeLists.txt

@@ -869,8 +869,8 @@ export(EXPORT FluidSynthTargets
 include(CMakePackageConfigHelpers)
 write_basic_package_version_file(
     FluidSynthConfigVersion.cmake
-    VERSION ${LIB_VERSION_INFO}
-    COMPATIBILITY SameMajorVersion
+    VERSION ${VERSION}
+    COMPATIBILITY SameMinorVersion
 )
 
 configure_file(FluidSynthConfig.cmake.in FluidSynthConfig.cmake @ONLY)

FluidSynthConfig.cmake.in

@@ -6,6 +6,5 @@
 # define variables for configuration options:
 # set(network-enabled @enable-network@)
 
-# finally, include the targets/version files
+# finally, include the targets file
 include("${CMAKE_CURRENT_LIST_DIR}/FluidSynthTargets.cmake")
-include("${CMAKE_CURRENT_LIST_DIR}/FluidSynthConfigVersion.cmake")

src/CMakeLists.txt

@@ -348,7 +348,7 @@ else ( MACOSX_FRAMEWORK )
   )
 endif ( MACOSX_FRAMEWORK )
 
-target_link_libraries ( libfluidsynth
+target_link_libraries ( libfluidsynth PRIVATE
     ${GLIB_LIBRARIES}
     ${GMODULE_LIBRARIES}
     ${LASH_LIBRARIES}
@@ -391,10 +391,12 @@ if ( FLUID_CPPFLAGS )
     PROPERTIES COMPILE_FLAGS ${FLUID_CPPFLAGS} )
 endif ( FLUID_CPPFLAGS )
 
-target_link_libraries ( fluidsynth
+target_link_libraries ( fluidsynth PRIVATE
     libfluidsynth
     ${SYSTEMD_LIBRARIES}
     ${FLUID_LIBS}
+    ${GLIB_LIBRARIES} # because g_file_test()
+    ${SDL2_LIBRARIES} # because SDL_Init() etc.
 )
 
 if ( MACOSX_FRAMEWORK )
@@ -420,7 +422,7 @@ endif ( MACOSX_FRAMEWORK )
 # build_interface: for the libfluidsynth target when imported from the build directory.
 # install_interface: for the target when imported from the installed directory.
 target_include_directories(libfluidsynth PUBLIC
-    "$<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include/;${CMAKE_SOURCE_DIR}/include/fluidsynth/;${CMAKE_BINARY_DIR}/include/;${CMAKE_BINARY_DIR}/include/fluidsynth/>"
+    "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include/;${PROJECT_BINARY_DIR}/include/>"
     "$<INSTALL_INTERFACE:${INCLUDE_INSTALL_DIR}>"
 )