diff --git a/trunk/auto/depends.sh b/trunk/auto/depends.sh
index 03befe882..f31f3696c 100755
--- a/trunk/auto/depends.sh
+++ b/trunk/auto/depends.sh
@@ -338,7 +338,7 @@ if [ $SRS_EXPORT_LIBRTMP_PROJECT = NO ]; then
     # check status
     ret=$?; if [[ $ret -ne 0 ]]; then echo "Build state-threads failed, ret=$ret"; exit $ret; fi
     # Always update the links.
-    (cd ${SRS_OBJS} && rm -f st && ln -sf ${SRS_PLATFORM}/st-srs/${_ST_OBJ} st)
+    (cd ${SRS_OBJS} && rm -rf st && ln -sf ${SRS_PLATFORM}/st-srs/${_ST_OBJ} st)
     if [ ! -f ${SRS_OBJS}/st/libst.a ]; then echo "Build state-threads static lib failed."; exit -1; fi
 fi
 
@@ -464,7 +464,7 @@ if [[ $SRS_SSL == YES && $SRS_USE_SYS_SSL != YES ]]; then
     # check status
     ret=$?; if [[ $ret -ne 0 ]]; then echo "Build openssl-1.1.0e failed, ret=$ret"; exit $ret; fi
     # Always update the links.
-    (cd ${SRS_OBJS} && rm -f openssl && ln -sf ${SRS_PLATFORM}/${OPENSSL_LIB} openssl)
+    (cd ${SRS_OBJS} && rm -rf openssl && ln -sf ${SRS_PLATFORM}/${OPENSSL_LIB} openssl)
     if [ ! -f ${SRS_OBJS}/openssl/lib/libssl.a ]; then echo "Build openssl-1.1.0e failed."; exit -1; fi
 fi
 
@@ -472,24 +472,19 @@ fi
 # live transcoding, ffmpeg-4.1, x264-core157, lame-3.99.5, libaacplus-2.0.2.
 #####################################################################################
 # Always link the ffmpeg tools if exists.
-if [[ -f /usr/local/bin/ffmpeg && ! -f ${SRS_OBJS}/ffmpeg/bin/ffmpeg ]]; then
-    mkdir -p ${SRS_OBJS}/ffmpeg/bin && ln -sf /usr/local/bin/ffmpeg ${SRS_OBJS}/ffmpeg/bin/ffmpeg
+if [[ -f /usr/local/bin/ffmpeg && ! -f ${SRS_OBJS}/${SRS_PLATFORM}/ffmpeg/bin/ffmpeg ]]; then
+    mkdir -p ${SRS_OBJS}/${SRS_PLATFORM}/ffmpeg/bin &&
+    ln -sf /usr/local/bin/ffmpeg ${SRS_OBJS}/${SRS_PLATFORM}/ffmpeg/bin/ffmpeg
 fi
 if [ $SRS_FFMPEG_TOOL = YES ]; then
-    if [[ -f ${SRS_OBJS}/ffmpeg/bin/ffmpeg ]]; then
+    if [[ -f ${SRS_OBJS}/${SRS_PLATFORM}/ffmpeg/bin/ffmpeg ]]; then
         echo "ffmpeg-4.1 is ok.";
     else
-        echo "build ffmpeg-4.1"; 
-        (
-            cd ${SRS_OBJS} && pwd_dir=`pwd` && 
-            rm -rf ffmepg.src && mkdir -p ffmpeg.src && cd ffmpeg.src &&
-            rm -f build_ffmpeg.sh && ln -sf ../../auto/build_ffmpeg.sh && . build_ffmpeg.sh &&
-            cd ${pwd_dir} && rm -rf ffmpeg && ln -sf ffmpeg.src/_release ffmpeg
-        )
+        echo "no ffmpeg found, please use srs-docker or --without-ffmpeg";
+        exit -1;
     fi
-    # check status
-    ret=$?; if [[ $ret -ne 0 ]]; then echo "build ffmpeg-4.1 failed, ret=$ret"; exit $ret; fi
-    if [ ! -f ${SRS_OBJS}/ffmpeg/bin/ffmpeg ]; then echo "build ffmpeg-4.1 failed."; exit -1; fi
+    # Always update the links.
+    (cd ${SRS_OBJS} && rm -rf ffmpeg && ln -sf ${SRS_PLATFORM}/ffmpeg)
 fi
 
 #####################################################################################
@@ -534,7 +529,7 @@ if [ $SRS_UTEST = YES ]; then
     # check status
     ret=$?; if [[ $ret -ne 0 ]]; then echo "Build gtest-1.6.0 failed, ret=$ret"; exit $ret; fi
     # Always update the links.
-    (cd ${SRS_OBJS} && rm -f gtest && ln -sf ${SRS_PLATFORM}/gtest-1.6.0 gtest)
+    (cd ${SRS_OBJS} && rm -rf gtest && ln -sf ${SRS_PLATFORM}/gtest-1.6.0 gtest)
     if [ ! -f ${SRS_OBJS}/gtest/include/gtest/gtest.h ]; then echo "Build gtest-1.6.0 failed."; exit -1; fi
 fi
 
@@ -557,6 +552,6 @@ if [ $SRS_GPERF = YES ]; then
     # check status
     ret=$?; if [[ $ret -ne 0 ]]; then echo "Build gperftools-2.1 failed, ret=$ret"; exit $ret; fi
     # Always update the links.
-    (cd ${SRS_OBJS} && rm -f pprof && ln -sf ${SRS_PLATFORM}/gperf/bin/pprof pprof)
+    (cd ${SRS_OBJS} && rm -rf pprof && ln -sf ${SRS_PLATFORM}/gperf/bin/pprof pprof)
     if [ ! -f ${SRS_OBJS}/gperf/bin/pprof ]; then echo "Build gperftools-2.1 failed."; exit -1; fi
 fi
diff --git a/trunk/auto/options.sh b/trunk/auto/options.sh
index 321288bc3..b3eec6712 100755
--- a/trunk/auto/options.sh
+++ b/trunk/auto/options.sh
@@ -105,6 +105,8 @@ SRS_TOOL_AR=ar
 SRS_TOOL_LD=ld
 SRS_TOOL_RANDLIB=randlib
 SRS_EXTRA_FLAGS=
+# Set the object files tag name.
+SRS_BUILD_TAG=
 
 #####################################################################################
 # menu
@@ -171,6 +173,7 @@ Toolchain options:          @see https://github.com/ossrs/srs/issues/1547#issuec
   --ld=<LD>                 Use linker tool LD, default is ld.
   --randlib=<RANDLIB>       Use randlib tool RANDLIB, default is randlib.
   --extra-flags=<EFLAGS>    Set EFLAGS as CFLAGS and CXXFLAGS. Also passed to ST as EXTRA_CFLAGS.
+  --build-tag=<TAG>         Set the build object directory suffix.
 
 Conflicts:
   1. --with-gmc vs --with-gmp: 
@@ -254,6 +257,7 @@ function parse_user_option() {
         --ld)                           SRS_TOOL_LD=${value}        ;;
         --randlib)                      SRS_TOOL_RANDLIB=${value}   ;;
         --extra-flags)                  SRS_EXTRA_FLAGS=${value}    ;;
+        --build-tag)                    SRS_BUILD_TAG=${value}      ;;
 
         --x86-x64)                      SRS_X86_X64=YES             ;;
         --x86-64)                       SRS_X86_X64=YES             ;;
@@ -538,6 +542,7 @@ SRS_AUTO_CONFIGURE="--prefix=${SRS_PREFIX}"
     if [ $SRS_LOG_TRACE = YES ]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --log-trace"; fi
     if [ $SRS_GCOV = YES ]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --gcov"; fi
     if [[ $SRS_EXTRA_FLAGS != '' ]]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --extra-flags=\\\"$SRS_EXTRA_FLAGS\\\""; fi
+    if [[ $SRS_BUILD_TAG != '' ]]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --build-tag=\\\"$SRS_BUILD_TAG\\\""; fi
     if [[ $SRS_TOOL_CC != '' ]]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --cc=$SRS_TOOL_CC"; fi
     if [[ $SRS_TOOL_CXX != '' ]]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --cxx=$SRS_TOOL_CXX"; fi
     if [[ $SRS_TOOL_AR != '' ]]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --ar=$SRS_TOOL_AR"; fi
diff --git a/trunk/auto/setup_variables.sh b/trunk/auto/setup_variables.sh
index 9d37edbf7..3865f005f 100755
--- a/trunk/auto/setup_variables.sh
+++ b/trunk/auto/setup_variables.sh
@@ -1,3 +1,24 @@
 #!/bin/bash
 
 # when options parsed, setup some variables, then build the depends.
+OS_KERNEL_NAME=$(uname -s)
+OS_KERNRL_RELEASE=$(uname -r|awk -F '-' '{print $1}')
+OS_PREFIX="Platform"
+SRS_PLATFORM="${OS_PREFIX}-${OS_KERNEL_NAME}-${OS_KERNRL_RELEASE}"
+if [[ ${SRS_BUILD_TAG} != "" ]]; then
+  SRS_PLATFORM="${SRS_PLATFORM}-${SRS_BUILD_TAG}"
+fi
+echo "SRS_WORKDIR: ${SRS_WORKDIR}, SRS_OBJS_DIR: ${SRS_OBJS_DIR}, SRS_OBJS: ${SRS_OBJS}, SRS_PLATFORM: ${SRS_PLATFORM}"
+
+# For src object files on each platform.
+(
+    cd ${SRS_OBJS_DIR} &&
+    rm -rf src utest srs research include lib srs_hls_ingester srs_mp4_parser &&
+    mkdir -p ${SRS_PLATFORM}/src && ln -sf ${SRS_PLATFORM}/src &&
+    mkdir -p ${SRS_PLATFORM}/utest && ln -sf ${SRS_PLATFORM}/utest &&
+    mkdir -p ${SRS_PLATFORM}/research && ln -sf ${SRS_PLATFORM}/research &&
+    mkdir -p ${SRS_PLATFORM}/include && ln -sf ${SRS_PLATFORM}/include &&
+    mkdir -p ${SRS_PLATFORM}/lib && ln -sf ${SRS_PLATFORM}/lib
+)
+echo "Fast cleanup, if need to do full cleanup, please use: make clean"
+
diff --git a/trunk/auto/utest.sh b/trunk/auto/utest.sh
index 1255e35a7..7dcde25af 100755
--- a/trunk/auto/utest.sh
+++ b/trunk/auto/utest.sh
@@ -16,7 +16,7 @@ mkdir -p ${SRS_OBJS}/utest
 # the prefix to generate the objs/utest/Makefile
 # dirs relative to current dir(objs/utest), it's trunk/objs/utest
 # trunk of srs, which contains the src dir, relative to objs/utest, it's trunk
-SRS_TRUNK_PREFIX=../..
+SRS_TRUNK_PREFIX=../../..
 # gest dir, relative to objs/utest, it's trunk/objs/gtest
 GTEST_DIR=${SRS_TRUNK_PREFIX}/${SRS_OBJS_DIR}/gtest
 
diff --git a/trunk/configure b/trunk/configure
index 810f586cc..7f9baecde 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -8,8 +8,6 @@ SRS_WORKDIR="."
 SRS_OBJS_DIR="objs"
 SRS_OBJS="${SRS_WORKDIR}/${SRS_OBJS_DIR}"
 SRS_MAKEFILE="Makefile"
-SRS_PLATFORM=`uname -s`-`uname -r|awk -F '-' '{print $1}'`
-echo "SRS_WORKDIR: ${SRS_WORKDIR}, SRS_OBJS_DIR: ${SRS_OBJS_DIR}, SRS_OBJS: ${SRS_OBJS}, SRS_PLATFORM: ${SRS_PLATFORM}"
 
 # linux shell color support.
 RED="\\033[31m"
@@ -43,11 +41,6 @@ mkdir -p ${SRS_OBJS}/${SRS_PLATFORM}
 # the auto generated variables.
 . auto/auto_headers.sh
 
-# For src object files on each platform.
-echo "Fast cleanup, if need to do full cleanup, please use: make clean"
-(cd ${SRS_OBJS_DIR} && rm -rf src srs srs_hls_ingester srs_mp4_parser &&
-mkdir -p ${SRS_PLATFORM}/src && ln -sf ${SRS_PLATFORM}/src)
-
 #####################################################################################
 # generate Makefile.
 #####################################################################################
@@ -348,7 +341,9 @@ mv ${SRS_WORKDIR}/${SRS_MAKEFILE} ${SRS_WORKDIR}/${SRS_MAKEFILE}.bk
 
 # generate phony header
 cat << END > ${SRS_WORKDIR}/${SRS_MAKEFILE}
-.PHONY: default _default install install-api help clean doclean destroy server srs_ingest_hls librtmp utest _prepare_dir $__mphonys
+.PHONY: default _default install install-api help clean destroy server srs_ingest_hls librtmp utest _prepare_dir $__mphonys
+.PHONY: clean_srs clean_modules clean_st clean_openssl clean_ffmpeg clean_nginx clean_cherrypy
+.PHONY: st
 
 # install prefix.
 SRS_PREFIX=${SRS_PREFIX}
@@ -369,14 +364,18 @@ _default: server srs_ingest_hls librtmp utest __modules $__mdefaults
 help:
 	@echo "Usage: make <help>|<clean>|<destroy>|<server>|<librtmp>|<utest>|<install>|<install-api>|<uninstall>"
 	@echo "     help               display this help menu"
-	@echo "     clean              cleanup project"
-	@echo "     destroy            Deep cleanup project and depends"
+	@echo "     clean              cleanup project and all depends"
+	@echo "     destroy            Cleanup all files for this platform in ${SRS_OBJS_DIR}/${SRS_PLATFORM}"
 	@echo "     server             build the srs(simple rtmp server) over st(state-threads)"
 	@echo "     librtmp            build the client publish/play library, and samples"
 	@echo "     utest              build the utest for srs"
 	@echo "     install            install srs to the prefix path"
 	@echo "     install-api        install srs and api-server to the prefix path"
 	@echo "     uninstall          uninstall srs from prefix path"
+	@echo "To clean special module:"
+	@echo "     clean_st           Clean depend st-srs in ${SRS_OBJS_DIR}/${SRS_PLATFORM}/st-srs"
+	@echo "     clean_openssl      Clean depend openssl in objs"
+	@echo "     clean_ffmpeg       Clean depend ffmpeg in objs"
 	@echo "@remark all modules will auto genearted and build"
 	@echo "For example:"
 	@echo "     make"
@@ -389,13 +388,34 @@ doclean:
 	(cd research/librtmp && make clean)
 	(cd research/api-server/static-dir && rm -rf crossdomain.xml forward live players)
 
-clean: doclean
-	@echo "You can do full clean by: make destroy"
+clean: clean_srs clean_modules clean_st clean_openssl clean_ffmpeg clean_nginx clean_cherrypy
+	@echo "You can clean each some components, see make help"
 
 destroy: clean
-	(cd 3rdparty/st-srs && rm -rf Linux_* Darwin_* obj)
-	(cd 3rdparty/ffmpeg-4.2-fit && rm -rf Linux-* Darwin-*)
-	(cd ${SRS_OBJS_DIR} && rm -rf Linux-* Darwin-*)
+	(cd ${SRS_OBJS_DIR} && rm -rf ${SRS_PLATFORM})
+
+clean_srs:
+	(cd ${SRS_OBJS_DIR} && rm -rf srs srs_utest)
+	(cd ${SRS_OBJS_DIR}/${SRS_PLATFORM} && rm -rf include lib utest)
+
+clean_modules:
+	(cd ${SRS_OBJS_DIR} && rm -rf $__mdefaults)
+
+clean_st:
+	(cd ${SRS_OBJS_DIR}/${SRS_PLATFORM}/st-srs && make clean)
+
+clean_openssl:
+	(cd ${SRS_OBJS_DIR}/${SRS_PLATFORM} && rm -rf openssl*)
+
+clean_ffmpeg:
+	(cd ${SRS_OBJS_DIR}/${SRS_PLATFORM} && rm -rf ffmpeg)
+
+clean_nginx:
+	(cd ${SRS_OBJS_DIR} && rm -rf nginx)
+
+clean_cherrypy:
+	(cd research/librtmp && make clean)
+	(cd research/api-server/static-dir && rm -rf crossdomain.xml forward live players)
 
 END
 
diff --git a/trunk/scripts/package.sh b/trunk/scripts/package.sh
index ac4928422..6a4fc3bc2 100755
--- a/trunk/scripts/package.sh
+++ b/trunk/scripts/package.sh
@@ -120,22 +120,22 @@ ok_msg "start build srs, ARM: $ARM, MIPS: $MIPS, PI: $PI, X86_64: $X86_X64, JOBS
 if [ $ARM = YES ]; then
     (
         cd $work_dir && 
-        ./configure --arm --jobs=$JOBS --prefix=$INSTALL && make
+        ./configure --arm --jobs=$JOBS --prefix=$INSTALL --build-tag=${os_machine} && make
     ) >> $log 2>&1
 elif [ $MIPS = YES ]; then
     (
         cd $work_dir && 
-        ./configure --mips --jobs=$JOBS --prefix=$INSTALL && make
+        ./configure --mips --jobs=$JOBS --prefix=$INSTALL --build-tag=${os_machine} && make
     ) >> $log 2>&1
 elif [ $PI = YES ]; then
     (
         cd $work_dir && 
-        ./configure --pi --jobs=$JOBS --prefix=$INSTALL && make
+        ./configure --pi --jobs=$JOBS --prefix=$INSTALL --build-tag=${os_machine} && make
     ) >> $log 2>&1
 elif [ $X86_X64 = YES ]; then
     (
         cd $work_dir && 
-        ./configure --x86-x64 --jobs=$JOBS --prefix=$INSTALL && make
+        ./configure --x86-x64 --jobs=$JOBS --prefix=$INSTALL --build-tag=${os_machine} && make
     ) >> $log 2>&1
 else
     failed_msg "invalid option, must be --x86-x64/--arm/--mips/--pi, see --help"; exit 1;