guix: fix flatpak build

diff --git a/contrib/guix/guix-build b/contrib/guix/guix-build
index 9b7927295991e116e0544e37d79ddddcfd5d6a8f..39166a780a2258b9491ab23d6a8eb9b6263bed39 100755 (executable)
--- a/contrib/guix/guix-build
+++ b/contrib/guix/guix-build
@@ -488,6 +488,7 @@ EOF
                                          --share="$OUTDIR"=/outdir \
                                          --keep-failed \
                                          --fallback \
+                                         --writable-root \
                                          ${SUBSTITUTE_URLS:+--substitute-urls="$SUBSTITUTE_URLS"} \
                                          ${ADDITIONAL_GUIX_COMMON_FLAGS} ${ADDITIONAL_GUIX_ENVIRONMENT_FLAGS} \
                                          -- env DISTNAME="$DISTNAME" \