leon@lola:~/snappy-xcape$ umask 0077
leon@lola:~/snappy-xcape$ snapcraft clean && snapcraft
Cleaning priming area for xcape 
Cleaning staging area for xcape 
Cleaning build for xcape 
Cleaning pulled source for xcape 
Cleaning up snapping area
Preparing to pull xcape 
Pulling xcape 
Cloning into '/home/leon/snappy-xcape/parts/xcape/src'...
remote: Counting objects: 8, done.
remote: Compressing objects: 100% (7/7), done.
remote: Total 8 (delta 0), reused 3 (delta 0), pack-reused 0
Unpacking objects: 100% (8/8), done.
Checking connectivity... done.
Preparing to build xcape 
Building xcape 
make -j8
cc -Wall `pkg-config --cflags xtst x11` -o xcape xcape.c `pkg-config --libs xtst x11` -pthread
make install DESTDIR=/home/leon/snappy-xcape/parts/xcape/install
install -d -m 0755 /home/leon/snappy-xcape/parts/xcape/install/usr/bin
install -d -m 0755 /home/leon/snappy-xcape/parts/xcape/install/usr/local/man/man1
install -m 0755 xcape /home/leon/snappy-xcape/parts/xcape/install/usr/bin/xcape
install -m 0644 xcape.1 /home/leon/snappy-xcape/parts/xcape/install/usr/local/man/man1/xcape.1
Staging xcape 
Priming xcape 
Snapping 'xcape' |                                                                                                                                                                                   
Snapped xcape_HEAD_amd64.snap
leon@lola:~/snappy-xcape$ umask 0002
leon@lola:~/snappy-xcape$ sudo snap install xcape_HEAD_amd64.snap && /snap/bin/xcape --help

Name   Version  Rev  Developer  Notes
xcape  HEAD     x11             -
execv failed: Permission denied