From e211cdd11dac60dbeb61d3849c88216dbdc5544d Mon Sep 17 00:00:00 2001
From: Florent Castelli <florent.castelli@gmail.com>
Date: Mon, 6 Feb 2017 04:18:51 +0100
Subject: [PATCH] cmake: Fix possible redefinition of imported target in
 FindALSA

---
 CMakeTests/FindALSA.cmake | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/CMakeTests/FindALSA.cmake b/CMakeTests/FindALSA.cmake
index 86c1510287..45e2bccdf4 100644
--- a/CMakeTests/FindALSA.cmake
+++ b/CMakeTests/FindALSA.cmake
@@ -47,11 +47,13 @@ FIND_PACKAGE_HANDLE_STANDARD_ARGS(ALSA
 if(ALSA_FOUND)
   set( ALSA_LIBRARIES ${ALSA_LIBRARY} )
   set( ALSA_INCLUDE_DIRS ${ALSA_INCLUDE_DIR} )
-  add_library(ALSA::ALSA UNKNOWN IMPORTED)
-  set_target_properties(ALSA::ALSA PROPERTIES
-    IMPORTED_LOCATION ${ALSA_LIBRARY}
-    INTERFACE_INCLUDE_DIRECTORIES ${ALSA_INCLUDE_DIR}
-  )
+  if(NOT TARGET ALSA::ALSA)
+    add_library(ALSA::ALSA UNKNOWN IMPORTED)
+    set_target_properties(ALSA::ALSA PROPERTIES
+      IMPORTED_LOCATION ${ALSA_LIBRARY}
+      INTERFACE_INCLUDE_DIRECTORIES ${ALSA_INCLUDE_DIR}
+    )
+  endif()
 endif()
 
 mark_as_advanced(ALSA_INCLUDE_DIR ALSA_LIBRARY)