User Switcher, just like sudo but worse
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CC ?= gcc
CFLAGS = -Wall -pedantic --std=c99 -O2
DBG_CFLAGS = -Wall -Werror -pedantic --std=c99 -O0 -g
SYSTEM != uname
LDFLAGS != if [ '${SYSTEM}' != 'OpenBSD' ]; then echo '-lcrypt'; fi
PREFIX = /usr/local
MANPREFIX = ${PREFIX}/share/man
us: us.c
${CC} ${LDFLAGS} ${DBG_CFLAGS} us.c -o us
install: us
mkdir -p ${DESTDIR}${PREFIX}/bin
cp -f us ${DESTDIR}${PREFIX}/bin/us
chown 0:0 ${DESTDIR}${PREFIX}/bin/us
chmod 4755 ${DESTDIR}${PREFIX}/bin/us
mkdir -p ${DESTDIR}${MANPREFIX}/man1
cp -f us.1 ${DESTDIR}${MANPREFIX}/man1/us.1
chmod 644 ${DESTDIR}${MANPREFIX}/man1/us.1
mkdir -p ${DESTDIR}${MANPREFIX}/man5
cp -f us.conf.5 ${DESTDIR}${MANPREFIX}/man5/us.conf.5
chmod 644 ${DESTDIR}${MANPREFIX}/man5/us.conf.5
rm -f ${DESTDIR}${PREFIX}/bin/us \
rm -f us us-dbg