$NetBSD$

Support using system vorbis and libogg.

--- CMakeLists.txt.orig	2020-12-07 09:04:06.000000000 +0000
+++ CMakeLists.txt
@@ -175,6 +175,14 @@ set(GORILLA_COMMON_SRC
   ${SRC_DIR}/common/gc_thread.c)
 
 # OGG/Vorbis
+if(SYSTEM_LIBRARIES)
+find_package(PkgConfig)
+pkg_check_modules(ogg REQUIRED)
+pkg_check_modules(vorbis REQUIRED)
+
+include_directories(${OGG_INCLUDE_DIRS})
+include_directories(${VORBIS_INCLUDE_DIRS})
+else()
 set(LIBOGGDIR ext/libogg)
 set(LIBVORBISDIR ext/libvorbis)
 
@@ -213,6 +221,7 @@ set(OGGVORBIS_SRC
   ${LIBVORBISDIR}/lib/synthesis.c
   ${LIBVORBISDIR}/lib/vorbisfile.c
   ${LIBVORBISDIR}/lib/window.c)
+endif()
 
 if(ENABLE_OSS)
   list(APPEND GORILLA_SRC ${SRC_DIR}/devices/ga_oss.c)
@@ -243,7 +252,7 @@ set(SIZE32 int32_t)
 set(USIZE32 uint32_t)
 set(SIZE64 int64_t)
 set(USIZE64 uint64_t)
-configure_file(ext/libogg/include/ogg/config_types.h.in ${CMAKE_SOURCE_DIR}/ext/libogg/include/ogg/config_types.h @ONLY)
+#configure_file(ext/libogg/include/ogg/config_types.h.in ${CMAKE_SOURCE_DIR}/ext/libogg/include/ogg/config_types.h @ONLY)
 
 
 source_group("include" FILES ${GORILLA_INCLUDE})