added tests for signal() and signal.h Daniel

* configure.in: added tests for signal() and signal.h
Daniel
diff --git a/configure.in b/configure.in
index 69302d5..b16e280 100644
--- a/configure.in
+++ b/configure.in
@@ -82,6 +82,7 @@
 AC_CHECK_HEADERS(ieeefp.h nan.h math.h fp_class.h float.h)
 AC_CHECK_HEADERS(stdlib.h sys/socket.h netinet/in.h arpa/inet.h)
 AC_CHECK_HEADERS(netdb.h sys/time.h sys/select.h sys/mman.h)
+AC_CHECK_HEADERS(signal.h)
 
 dnl Specific dir for HTML output ?
 if test "x$with_html_dir" = "x" ; then
@@ -108,7 +109,7 @@
 AC_CHECK_FUNCS(strdup strndup strerror)
 AC_CHECK_FUNCS(finite isnand fp_class class fpclass)
 AC_CHECK_FUNCS(strftime localtime)
-AC_CHECK_FUNCS(stat _stat)
+AC_CHECK_FUNCS(stat _stat signal)
 
 dnl Checking the standard string functions availability
 AC_CHECK_FUNCS(printf sprintf fprintf snprintf vfprintf vsprintf vsnprintf sscanf,,