diff --git a/build.sh b/build.sh
index a0f380e..0f2da37 100644
--- a/build.sh
+++ b/build.sh
@@ -30,8 +30,8 @@ pkg_install()
         apt -y install libsystemd-dev libjson-c-dev libpcre2-dev clamav-freshclam
         apt -y install libltdl-dev
         
-        #Debian系统使用libiptc库需要nftables切换到iptables
-        #Switching to the legacy version:(切换到 iptables)
+        # Debian系统使用libiptc库需要nftables切换到iptables
+        # Switching to the legacy version:(切换到 iptables)
         update-alternatives --set iptables /usr/sbin/iptables-legacy
         update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
         update-alternatives --set arptables /usr/sbin/arptables-legacy
@@ -52,9 +52,9 @@ pkg_install()
         
         yum -y install centos-release-scl
         yum -y install devtoolset-11-gcc
-        #source /opt/rh/devtoolset-11/enable                                    #临时
+        #source /opt/rh/devtoolset-11/enable                                        #临时
         
-        if test "`grep "devtoolset" /etc/profile`" != ""; then
+        if test "`grep "devtoolset" /etc/profile`" = ""; then
             echo "source /opt/rh/devtoolset-11/enable" >> /etc/profile              #永久
         fi
         source /opt/rh/devtoolset-11/enable
@@ -73,13 +73,17 @@ main()
     
     make clean; make
     
-    if test -f /etc/cron.d/clamav-update; then  # 去除自动更新病毒库
-        mv /etc/cron.d/clamav-update /root
+    if test "$OS" = "centos"; then
+        if test -f /etc/cron.d/clamav-update; then  # 去除自动更新病毒库
+            mv /etc/cron.d/clamav-update /root
+        fi
+        
+        if test -f /etc/freshclam.conf; then        # 更改病毒库镜像
+            sed -i "s/DatabaseMirror .*/DatabaseMirror clamavdb.c3sl.ufpr.br/g" /etc/freshclam.conf
+        fi
+
     fi
     
-    if test -f /etc/freshclam.conf; then        # 更改病毒库镜像
-        sed -i "s/DatabaseMirror .*/DatabaseMirror clamavdb.c3sl.ufpr.br/g" /etc/freshclam.conf
-    fi
     
     if test -f /etc/clamav/freshclam.conf; then
         sed -i "s/DatabaseMirror .*/DatabaseMirror clamavdb.c3sl.ufpr.br/g" /etc/clamav/freshclam.conf
@@ -88,6 +92,16 @@ main()
     fi
     
     
+    if test "$OS" = "debian"; then
+        condition=$(awk -v num1=${OS_VER} -v num2=11 'BEGIN{print(num1>num2)?"0":"1"}')
+        if test "$condition" = "1"; then            # Debian系统版本小于11时, libclamav库版本低时
+            cd clamscan/libclamav/; bash build.sh
+            cp /usr/lib/x86_64-linux-gnu/libclamav.so.9.0.5 /usr/lib/x86_64-linux-gnu/libclamav.so.9.0.5.backup
+            cp clamscan/libclamav/.libs/libclamav.so.9.0.5 /usr/lib/x86_64-linux-gnu/
+        fi
+    fi
+    
+    
     tmux new-session -s main -d && tmux send -t main './rhost -d' ENTER
     
     tmux at -t main