Trying to compile for FreeBSD:

cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c rsync.c -o rsync.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c generator.c -o generator.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c receiver.c -o receiver.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c cleanup.c -o cleanup.occ -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c rsync.c -o rsync.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c generator.c -o generator.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c receiver.c -o receiver.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c cleanup.c -o cleanup.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c sender.c -o sender.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c exclude.c -o exclude.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c util.c -o util.o
util.c: In function 'try_a_force_change':
util.c:141: error: 'ret' undeclared (first use in this function)
util.c:141: error: (Each undeclared identifier is reported only once
util.c:141: error: for each function it appears in.)
*** Error code 1

cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c sender.c -o sender.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c exclude.c -o exclude.o
cc -std=gnu99 -I. -I. -O2 -pipe -march=nocona -I/usr/local/include -fno-strict-aliasing -DHAVE_CONFIG_H -Wall -W -I./popt  -c util.c -o util.o
util.c: In function 'try_a_force_change':
util.c:141: error: 'ret' undeclared (first use in this function)
util.c:141: error: (Each undeclared identifier is reported only once
util.c:141: error: for each function it appears in.)
*** Error code 1

Trivial fix follows, although I think this code should be reviewed.