diff --git a/trunk/auto/build_ffmpeg.sh b/trunk/auto/build_ffmpeg.sh
index 551ed683d..23949abad 100755
--- a/trunk/auto/build_ffmpeg.sh
+++ b/trunk/auto/build_ffmpeg.sh
@@ -28,7 +28,7 @@ else
     cd $ff_current_dir &&
     rm -rf yasm-1.2.0 && unzip -q ${ff_src_dir}/yasm-1.2.0.zip &&
     cd yasm-1.2.0 && ./configure --prefix=${ff_release_dir} &&
-    make ${SRS_JOBS} && make install
+    make && make install
     ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build yasm-1.2.0 failed"; exit 1; fi
 fi
 # add yasm to path, for x264 to use yasm directly.
@@ -43,7 +43,7 @@ else
     cd $ff_current_dir &&
     rm -rf libaacplus-2.0.2 && unzip -q ${ff_src_dir}/libaacplus-2.0.2.zip &&
     cd libaacplus-2.0.2 && cp ../${ff_src_dir}/libaacplus-patch-26410-800.zip src/26410-800.zip &&
-    bash autogen.sh && ./configure --prefix=${ff_release_dir} --enable-static && make ${SRS_JOBS} && make install
+    bash autogen.sh && ./configure --prefix=${ff_release_dir} --enable-static && make && make install
     ret=$?; if [[ 0 -ne ${ret} ]]; then echo "build libaacplus-2.0.2 failed"; exit 1; fi
 fi
 
diff --git a/trunk/auto/depends.sh b/trunk/auto/depends.sh
old mode 100644
new mode 100755
index 784310b27..fa63ed563
--- a/trunk/auto/depends.sh
+++ b/trunk/auto/depends.sh
@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# variables:
+# SRS_JOBS: the build jobs, parent script must set it.
+
 #####################################################################################
 #####################################################################################
 # prepare the depends tools and libraries
@@ -183,7 +186,7 @@ else
         rm -rf ${SRS_OBJS}/st-1.9 && cd ${SRS_OBJS} && 
         unzip -q ../3rdparty/st-1.9.zip && cd st-1.9 && 
         patch -p1 < ../../3rdparty/1.st.arm.Makefile.patch && 
-        make linux-debug ${SRS_JOBS}&&
+        make linux-debug &&
         cd .. && rm -f st && ln -sf st-1.9/obj st
     )
 fi
@@ -205,7 +208,7 @@ if [ $SRS_HTTP = YES ]; then
             cd http-parser-2.1 && 
             sed -i "s/CPPFLAGS_FAST +=.*$/CPPFLAGS_FAST = \$\(CPPFLAGS_DEBUG\)/g" Makefile &&
             sed -i "s/CFLAGS_FAST =.*$/CFLAGS_FAST = \$\(CFLAGS_DEBUG\)/g" Makefile &&
-            make package ${SRS_JOBS} &&
+            make package &&
             cd .. && rm -f hp && ln -sf http-parser-2.1 hp
         )
     fi
@@ -352,7 +355,7 @@ if [ $SRS_SSL = YES ]; then
             rm -rf ${SRS_OBJS}/openssl-1.0.1f && cd ${SRS_OBJS} && 
             unzip -q ../3rdparty/openssl-1.0.1f.zip && cd openssl-1.0.1f && 
             ./config --prefix=`pwd`/_release -no-shared && 
-            make ${SRS_JOBS} && make install &&
+            make && make install &&
             cd .. && ln -sf openssl-1.0.1f/_release openssl
         )
     fi
diff --git a/trunk/configure b/trunk/configure
index 034de0b0b..2906f94c6 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -15,7 +15,9 @@ YELLOW="\\e[33m"
 BLACK="\\e[0m"
 
 #####################################################################################
-# parse user options, set the variables like SRS_SSL/SRS_HLS/SRS_FFMPEG/SRS_HTTP
+# parse user options, set the variables like:
+# srs features: SRS_SSL/SRS_HLS/SRS_FFMPEG/SRS_HTTP/SRS_RESEARCH/SRS_UTEST
+# build options: SRS_JOBS
 #####################################################################################
 # parse options, exit with error when parse options invalid.
 . auto/options.sh