compiling with freebsd

[robberer]

Hi,

if i try to compile this on FreeBSD 10 with gcc 4.8.5 i get the following error:

 # make rastertozj.o
gcc -Wl,-rpath,/usr/lib -Wall -fPIC -O3 -c rastertozj.c
rastertozj.c: In function 'pageSetup':
rastertozj.c:191:13: error: lvalue required as left operand of assignment
  old_signal = signal(15,cancelJob);
             ^
*** Error code 1

Stop.
make: stopped in /root/zj-58

How can I fix this ?