Very Computer

I am trying to compile the ifmail fidonet-transport agent.
But I get stuck by the following compilations error messages:

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bash# make
for d in iflib ifgate ifcico; do (cd $d && echo $d && make  all) || exit; done;
iflib
make[1]: Entering directory `/usr/src/ifmail/iflib'
gcc -O2 -Wall -I. -DDEBUGFILE=\""/var/log/ifmail/ifdebug"\" -DLOGFILE=\""/var/
log/ifmail/iflog"\" -DCONFIGFILE=\""/etc/ifmail/config"\" -DLOCKDIR=\""/usr/
spool/uucp"\" -DPUBDIR=\""/usr/spool/uucppublic"\" -DMAILLOG=LOG_LOCAL0
-DNEWSLOG=LOG_LOCAL0 -DCICOLOG=LOG_LOCAL0 -DHAS_STATFS -DSTATFS_IN_VFS_H
-DHAS_SETSID -DHAS_NDBM_H -DDONT_HAVE_TM_GMTOFF -DHAS_TERMIOS_H
-DASCII_LOCKFILES -DHAS_FSYNC -DHAS_IOCTL_H -DHAS_REGEX_H -DHAS_TCP -DFORCEINTL
-DHAS_SYSLOG -DNEED_UUCPFROM -DNEED_BSY -DREGEX_NEED_CARET -DNEED_TRAP
-DSLAVE_SENDS_NAK_TOO -c trap.c
trap.c: In function `trap':
trap.c:69: parameter `context' has incomplete type
trap.c:85: warning: `stack' may be used uninitialized in this function
make[1]: *** [trap.o] Error 1
make[1]: Leaving directory `/usr/src/ifmail/iflib'
make: *** [all] Error 1
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who can help me? - Any suggestions appreciated!

thanks in advance, Ulrich

BTW: I use Linux 1.0 Slackware 1.2.2
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