[bug-gv] SIGCLD is needed

[Zhong Ren]

Hi,

My first attempt of ./configure told me this:

checking for SIGCLD... no
checking for SIGCHLD... yes
configure: error: SIGCLD is needed. You can try --enable-SIGCHLD-fallback. It's 
secure on MacOS X, but on FreeBSD the fallback creates zombies.

Since this is on MacOS X, I tried ./configure --enable-SIGCHLD-fallback

configure finished without error.  But make gives this:

callbacks.c: In function ‘cb_presentation’:
callbacks.c:1034: error: ‘sighandler_t’ undeclared

It seems to me that the problem is still in configure.  Any help would be much 
appreciated.

Zhong Ren