Compiler error in signal_2.c RTEMS 4.12 m68k

[Eric Williams]

../../../../../../rtems/c/src/../../cpukit/posix/src/signal_2.c:30:1:
error: unknown type name 'sighandler_t'
 sighandler_t signal(
 ^~~~~~~~~~~~
../../../../../../rtems/c/src/../../cpukit/posix/src/signal_2.c:32:3:
error: unknown type name 'sighandler_t'
   sighandler_t  handler
   ^~~~~~~~~~~~
make[5]: *** [src/libposix_a-signal_2.o] Error 1
make[5]: Leaving directory
`/home/eric/rtems/4.12/m68k/m68k-rtems4.12/c/mvme162/cpukit/posix'

> head config.log
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by rtems configure 4.11.99.0, which was
generated by GNU Autoconf 2.69.  Invocation command line was

  $ ../rtems/configure --target=m68k-rtems4.12 --enable-rtemsbsp=mvme162
--disable-networking --enable-posix --prefix=/opt/rtems/4.12
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