diff --git a/CMakeLists.txt b/CMakeLists.txt
index 15e679930..b4d56439f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,7 @@ set(CMAKE_C_EXTENSIONS ON)
 include(CheckIPOSupported)
 check_ipo_supported(RESULT supported OUTPUT error)
 if (supported)
-    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+	set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
 endif()
 
 if(NOT DEFINED VENDOR)
@@ -756,18 +756,23 @@ if (WITH_DSP_FFMPEG)
 	# Deactivate FFmpeg backend for sound, if the version is too old.
 	# See libfreerdp/codec/dsp_ffmpeg.h
 	file(STRINGS "${AVCODEC_INCLUDE_DIR}/libavcodec/version.h" AV_VERSION_FILE REGEX "LIBAVCODEC_VERSION_M[A-Z]+[\t ]*[0-9]+")
+	if (EXISTS "${AVCODEC_INCLUDE_DIR}/libavcodec/version_major.h")
+		file(STRINGS "${AVCODEC_INCLUDE_DIR}/libavcodec/version_major.h" AV_VERSION_FILE2 REGEX "LIBAVCODEC_VERSION_M[A-Z]+[\t ]*[0-9]+")
+		list(APPEND AV_VERSION_FILE ${AV_VERSION_FILE2})
+	endif()
+
 	FOREACH(item ${AV_VERSION_FILE})
 	  STRING(REGEX MATCH "LIBAVCODEC_VERSION_M[A-Z]+[\t ]*[0-9]+" litem ${item})
-	IF(litem)
-			string(REGEX REPLACE "[ \t]+" ";" VSPLIT_LINE ${litem})
-			list(LENGTH VSPLIT_LINE VSPLIT_LINE_LEN)
-			if (NOT "${VSPLIT_LINE_LEN}" EQUAL "2")
-				message(ERROR "invalid entry in libavcodec version header ${item}")
-			endif(NOT "${VSPLIT_LINE_LEN}" EQUAL "2")
-			list(GET VSPLIT_LINE 0 VNAME)
-			list(GET VSPLIT_LINE 1 VVALUE)
-			set(${VNAME} ${VVALUE})
-	ENDIF(litem)
+		IF(litem)
+				string(REGEX REPLACE "[ \t]+" ";" VSPLIT_LINE ${litem})
+				list(LENGTH VSPLIT_LINE VSPLIT_LINE_LEN)
+				if (NOT "${VSPLIT_LINE_LEN}" EQUAL "2")
+					message(ERROR "invalid entry in libavcodec version header ${item}")
+				endif(NOT "${VSPLIT_LINE_LEN}" EQUAL "2")
+				list(GET VSPLIT_LINE 0 VNAME)
+				list(GET VSPLIT_LINE 1 VVALUE)
+				set(${VNAME} ${VVALUE})
+		ENDIF(litem)
 	ENDFOREACH(item ${AV_VERSION_FILE})
 
 	set(AVCODEC_VERSION "${LIBAVCODEC_VERSION_MAJOR}.${LIBAVCODEC_VERSION_MINOR}.${LIBAVCODEC_VERSION_MICRO}")
@@ -965,9 +970,9 @@ endif()
 set(FREERDP_BUILD_CONFIG_LIST "")
 GET_CMAKE_PROPERTY(res VARIABLES)
 FOREACH(var ${res})
-        IF (var MATCHES "^WITH_*|^BUILD_TESTING|^HAVE_*")
-                LIST(APPEND FREERDP_BUILD_CONFIG_LIST "${var}=${${var}}")
-        ENDIF()
+		IF (var MATCHES "^WITH_*|^BUILD_TESTING|^HAVE_*")
+				LIST(APPEND FREERDP_BUILD_CONFIG_LIST "${var}=${${var}}")
+		ENDIF()
 ENDFOREACH()
 string(REPLACE ";" " " FREERDP_BUILD_CONFIG "${FREERDP_BUILD_CONFIG_LIST}")