noRoot

If you are compiling daemontools on ubuntu and you get:

<snip>

./compile subgetopt.c
./choose cl trywaitp haswaitp.h1 haswaitp.h2 > haswaitp.h
./compile wait_nohang.c
./compile wait_pid.c
./makelib unix.a alloc.o alloc_re.o buffer.o buffer_0.o buffer_1.o \
	buffer_2.o buffer_get.o buffer_put.o buffer_read.o buffer_write.o \
	coe.o env.o error.o error_str.o fd_copy.o fd_move.o fifo.o lock_ex.o \
	lock_exnb.o ndelay_off.o ndelay_on.o open_append.o open_read.o \
	open_trunc.o open_write.o openreadclose.o pathexec_env.o \
	pathexec_run.o prot.o readclose.o seek_set.o sgetopt.o sig.o \
	sig_block.o sig_catch.o sig_pause.o stralloc_cat.o stralloc_catb.o \
	stralloc_cats.o stralloc_eady.o stralloc_opyb.o stralloc_opys.o \
	stralloc_pend.o strerr_die.o strerr_sys.o subgetopt.o wait_nohang.o \
	wait_pid.o
./load envdir unix.a byte.a
collect2: ld terminated with signal 11 [Segmentation fault]
/usr/bin/ld: make: *** [envdir] Error 1
Copying commands into ./command...
cp: cannot stat `compile/svscan': No such file or directory

</snip>

OR you are trying to compile ucspi-tcp and you get an error like one below:

<snip>

./compile str_start.c
./compile uint16_pack.c
./compile uint16_unpack.c
./compile uint32_pack.c
./compile uint32_unpack.c
./makelib byte.a byte_chr.o byte_copy.o byte_cr.o \
	byte_diff.o byte_rchr.o byte_zero.o case_diffb.o \
	case_diffs.o fmt_ulong.o ip4_fmt.o ip4_scan.o scan_ulong.o \
	str_chr.o str_diff.o str_len.o str_start.o uint16_pack.o \
	uint16_unpack.o uint32_pack.o uint32_unpack.o
( ( ./compile trylsock.c && \
	./load trylsock -lsocket -lnsl ) >/dev/null 2>&1 \
	&& echo -lsocket -lnsl || exit 0 ) > socket.lib
rm -f trylsock.o trylsock
./load tcpserver rules.o remoteinfo.o timeoutconn.o cdb.a \
	dns.a time.a unix.a byte.a  `cat socket.lib`
collect2: ld terminated with signal 11 [Segmentation fault]
/usr/bin/ld: make: *** [tcpserver] Error 1

Edit src/error.h in daemontools or error.h in ucspi-tcp and remove the line

extern int errno;

replace it with

#include <errno.h>

and recompile it.