commit 6509952dd6eff48d608a0e4124fa771bfaf53b53
Author: Andreas Sturmlechner <andreas.sturmlechner@gmail.com>
Date:   Sun Apr 16 21:09:55 2017 +0200

    Fix build without ALSA again

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 30e6a98..fb79bdd 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -7,7 +7,10 @@ if(CMAKE_COMPILER_IS_GNUCXX)
 endif()
 
 find_package(Alsa)
-alsa_configure_file(${CMAKE_CURRENT_BINARY_DIR}/config-alsa.h)
+if(ALSA_FOUND)
+    alsa_configure_file(${CMAKE_CURRENT_BINARY_DIR}/config-alsa.h)
+    add_definitions(-DHAVE_LIBASOUND2)
+endif(ALSA_FOUND)
 
 set(wmlib_audio_SRCS
         wmlib/audio/audio.c