diff --git a/compile/src/tigervnc/build.sh b/compile/src/tigervnc/build.sh
index 69850bd1..792af573 100644
--- a/compile/src/tigervnc/build.sh
+++ b/compile/src/tigervnc/build.sh
@@ -74,8 +74,9 @@ SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 
 
 # set -u; err if not exist
-DEST_DIR="/" #/tmp/xx-install> /
 test -z "$TARGETPATH" && export TARGETPATH=/opt/base
+DEST_DIR="/" #/tmp/xx-install> /
+INS_PREFIX=$TARGETPATH
 # rm -rf $LOGS; #avoid deleted @batch-mode
 CACHE=$TARGETPATH/../.cache; LOGS=$TARGETPATH/../.logs; mkdir -p $CACHE $LOGS
 function down_catfile(){
@@ -317,7 +318,7 @@ log "Configuring TigerVNC..."
         -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY \
         -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ONLY \
         -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER \
-        -DCMAKE_INSTALL_PREFIX=/usr \
+        -DCMAKE_INSTALL_PREFIX=$INS_PREFIX \
         -DCMAKE_BUILD_TYPE=Release \
         -DINSTALL_SYSTEMD_UNITS=OFF \
         -DENABLE_NLS=OFF \
@@ -337,7 +338,7 @@ autoreconf -fiv /tmp/tigervnc/unix/xserver
     cd /tmp/tigervnc/unix/xserver && CFLAGS="$CFLAGS -Wno-implicit-function-declaration" ./configure \
         --build=$(TARGETPLATFORM= xx-clang --print-target-triple) \
         --host=$(xx-clang --print-target-triple) \
-        --prefix=/usr \
+        --prefix=$INS_PREFIX \
         --sysconfdir=/etc/X11 \
         --localstatedir=/var \
         --with-xkb-path=${TARGETPATH}/usr/share/X11/xkb \
@@ -471,7 +472,7 @@ log "Configuring xkbcomp..."
     LDFLAGS="-Wl,--as-needed --static -static -Wl,--strip-all -Wl,--start-group -lX11 -lxcb -lXdmcp -lXau -Wl,--end-group" LIBS="$LDFLAGS" ./configure \
         --build=$(TARGETPLATFORM= xx-clang --print-target-triple) \
         --host=$(xx-clang --print-target-triple) \
-        --prefix=/usr \
+        --prefix=$INS_PREFIX \
 )
 
 log "Compiling xkbcomp..."