error emerging dde-base/dtkwidget-2.1.1

[guyuming76]

Calculating dependencies... done!
[ebuild  NS    ] dde-base/dtkwidget-2.1.1 [5.4.10]
[ebuild  N     ] dde-base/dde-control-center-5.0.0  USE="-redshift -systemd" 

Would you like to merge these packages? [Yes/No] yes

>>> Verifying ebuild manifests

>>> Emerging (1 of 2) dde-base/dtkwidget-2.1.1::deepin
 * Fetching files in the background.
 * To view fetch progress, run in another terminal:
 * tail -f /var/log/emerge-fetch.log
 * dtkwidget-2.1.1.tar.gz SHA256 size ;-) ...                                                                                                                                                             [ ok ]
>>> Unpacking source...
>>> Unpacking dtkwidget-2.1.1.tar.gz to /var/tmp/portage/dde-base/dtkwidget-2.1.1/work
>>> Source unpacked in /var/tmp/portage/dde-base/dtkwidget-2.1.1/work
>>> Preparing source in /var/tmp/portage/dde-base/dtkwidget-2.1.1/work/dtkwidget-2.1.1 ...
 * Applying 2.1.1-build-with-qt5.15.patch ...                                                                                                                                                             [ ok ]
 * Running qmake ...
Info: creating stash file /var/tmp/portage/dde-base/dtkwidget-2.1.1/work/dtkwidget-2.1.1/.qmake.stash
/var/tmp/portage/dde-base/dtkwidget-2.1.1/work/dtkwidget-2.1.1/dtkwidget.pro:1: Cannot find feature dtk2_lib                                                                                              [ ok ]
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dde-base/dtkwidget-2.1.1/work/dtkwidget-2.1.1 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dde-base/dtkwidget-2.1.1/work/dtkwidget-2.1.1 ...
make -j2 
x86_64-pc-linux-gnu-g++ -Wl,-O1 -Wl,--as-needed -o dtkwidget    /usr/lib64/libQt5Gui.so /usr/lib64/libQt5Core.so -lGL -lpthread   
/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../lib64/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
make: *** [Makefile:273: dtkwidget] Error 1
 * ERROR: dde-base/dtkwidget-2.1.1::deepin failed (compile phase):
 *   emake failed