	Explicitly #include <signal.h>
	required for FreeBSD (and probably others).

diff -ur dvisvgm-1.0.8.orig/src/Process.cpp dvisvgm-1.0.8/src/Process.cpp
--- dvisvgm-1.0.8.orig/src/Process.cpp	2011-05-24 08:56:10.000000000 +0200
+++ dvisvgm-1.0.8/src/Process.cpp	2011-06-03 10:33:00.000000000 +0200
@@ -24,6 +24,7 @@
 #else
 #include <fcntl.h>
 #include <sys/wait.h>
+#include <signal.h>
 #include <unistd.h>
 #endif
 
