diff --git a/packaging/GNU-Linux/appimage/build.sh b/packaging/GNU-Linux/appimage/build.sh
--- a/packaging/GNU-Linux/appimage/build.sh
+++ b/packaging/GNU-Linux/appimage/build.sh
@@ -69,6 +69,7 @@
 
 useradd -U builder
 mkdir build
+chown -R builder:builder ccache
 chown builder:builder build
 cd build
 
@@ -78,7 +79,7 @@
 
 mkdir -pv /run/user/test
 chown builder:builder /run/user/test
-su builder -c "$thisDir"/build-unprivileged.sh || exit 1
+su builder -c "env PATH='$PATH' '$thisDir'/build-unprivileged.sh" || exit 1
 
 wget https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
 wget https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage