Backoprt of
https://github.com/LMMS/lmms/pull/3203/commits/a76b944ead9d8bc782b985708fdf26bfd4b8782d

--- lmms/cmake/modules/BuildPlugin.cmake
+++ lmms/cmake/modules/BuildPlugin.cmake
@@ -26,10 +26,17 @@
 		SET(PLUGIN_EMBEDDED_RESOURCES ${NEW_ARGS})
 
 		SET(ER_H "${CMAKE_CURRENT_BINARY_DIR}/embedded_resources.h")
-		ADD_CUSTOM_COMMAND(OUTPUT ${ER_H}
-			COMMAND ${BIN2RES}
-			ARGS ${PLUGIN_EMBEDDED_RESOURCES} > "${ER_H}"
-			DEPENDS bin2res)
+		IF(CMAKE_VERSION VERSION_LESS 3.0)
+			ADD_CUSTOM_COMMAND(OUTPUT ${ER_H}
+				COMMAND ${BIN2RES}
+				ARGS ${PLUGIN_EMBEDDED_RESOURCES} > "${ER_H}"
+				DEPENDS bin2res)
+		ELSE()
+			ADD_CUSTOM_COMMAND(OUTPUT ${ER_H}
+				COMMAND bin2res
+				ARGS ${PLUGIN_EMBEDDED_RESOURCES} > ${ER_H}
+				DEPENDS bin2res)
+		ENDIF()
 	ENDIF(ER_LEN)
 
 	IF(QT5)
--- lmms/CMakeLists.txt
+++ lmms/CMakeLists.txt
@@ -7,11 +7,6 @@
 IF(COMMAND CMAKE_POLICY)
 	CMAKE_POLICY(SET CMP0005 NEW)
 	CMAKE_POLICY(SET CMP0003 NEW)
-	IF (CMAKE_MAJOR_VERSION GREATER 2)
-		CMAKE_POLICY(SET CMP0026 OLD)
-		CMAKE_POLICY(SET CMP0045 NEW)
-		CMAKE_POLICY(SET CMP0050 OLD)
-	ENDIF()
 ENDIF(COMMAND CMAKE_POLICY)
 
 INCLUDE(AddFileDependencies)
@@ -532,15 +527,20 @@
 ENDIF()
 
 # embedded resources stuff
-IF(WIN32 OR WIN64)
-	# compile buildtools native
-	SET(BIN2RES_CPP "${CMAKE_SOURCE_DIR}/buildtools/bin2res.cpp")
-	SET(BIN2RES "${CMAKE_BINARY_DIR}/bin2res")
-	ADD_CUSTOM_TARGET(bin2res COMMAND g++ "\"${BIN2RES_CPP}\"" -o "\"${BIN2RES}\"" DEPENDS "${BIN2RES_CPP}")
-ELSE(WIN32 OR WIN64)
+IF(CMAKE_VERSION VERSION_LESS 3.0)
+	IF(WIN32 OR WIN64)
+		# compile buildtools native
+		SET(BIN2RES_CPP "${CMAKE_SOURCE_DIR}/buildtools/bin2res.cpp")
+		SET(BIN2RES "${CMAKE_BINARY_DIR}/bin2res")
+		ADD_CUSTOM_TARGET(bin2res COMMAND g++ "\"${BIN2RES_CPP}\""
+			-o "\"${BIN2RES}\"" DEPENDS "${BIN2RES_CPP}")
+	ELSE(WIN32 OR WIN64)
+		ADD_EXECUTABLE(bin2res buildtools/bin2res.cpp)
+		GET_TARGET_PROPERTY(BIN2RES bin2res LOCATION)
+	ENDIF(WIN32 OR WIN64)
+ELSE()
 	ADD_EXECUTABLE(bin2res buildtools/bin2res.cpp)
-	GET_TARGET_PROPERTY(BIN2RES bin2res LOCATION)
-ENDIF(WIN32 OR WIN64)
+ENDIF()
 
 # we somehow have to make LMMS-binary depend on MOC-files
 ADD_FILE_DEPENDENCIES("${CMAKE_BINARY_DIR}/lmmsconfig.h")
--- lmms/src/CMakeLists.txt
+++ lmms/src/CMakeLists.txt
@@ -45,7 +45,15 @@
 
 SET(lmms_EMBEDDED_RESOURCES "${CMAKE_SOURCE_DIR}/doc/AUTHORS" "${CMAKE_SOURCE_DIR}/LICENSE.txt" "${CONTRIBUTORS}")
 SET(LMMS_ER_H "${CMAKE_CURRENT_BINARY_DIR}/embedded_resources.h")
-ADD_CUSTOM_COMMAND(OUTPUT "${LMMS_ER_H}" COMMAND "${BIN2RES}" ARGS ${lmms_EMBEDDED_RESOURCES} > "${LMMS_ER_H}" DEPENDS bin2res)
+IF(CMAKE_VERSION VERSION_LESS 3.0)
+	ADD_CUSTOM_COMMAND(OUTPUT "${LMMS_ER_H}" COMMAND "${BIN2RES}"
+		ARGS ${lmms_EMBEDDED_RESOURCES} > "\"${LMMS_ER_H}\""
+		DEPENDS bin2res)
+ELSE()
+	ADD_CUSTOM_COMMAND(OUTPUT "${LMMS_ER_H}" COMMAND bin2res
+		ARGS ${lmms_EMBEDDED_RESOURCES} > "\"${LMMS_ER_H}\""
+		DEPENDS bin2res)
+ENDIF()
 
 # Paths relative to lmms executable
 FILE(RELATIVE_PATH LIB_DIR_RELATIVE "/${BIN_DIR}" "/${LIB_DIR}")