[PATCH 1/2] Fix struct ip_mreq detection

[Tristan Colgate <tcolgate@gmail.com>]

Probably not the ideal fix, I tried using AC_CHECK_TYPE and adding
netinet/in.h but it didn't work. I've just copied the approach used
for LINGER

-- 
Tristan Colgate-McFarlane
----
  "You can get all your daily vitamins from 52 pints of guiness, and a
glass of milk"

 configure.ac |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/configure.ac b/configure.ac
index 34ec603..ec82791 100644
--- a/configure.ac
+++ b/configure.ac
@@ -673,7 +673,22 @@ AC_CHECK_TYPE(socklen_t, ,
 #endif
 #include <sys/socket.h>
 ])
-AC_CHECK_TYPE(struct ip_mreq)
+
+AC_MSG_CHECKING(for struct ip_mreq)
+AC_CACHE_VAL(scm_cv_struct_ip_mreq,
+        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>]],
+                          [[struct ip_mreq req;]])],
+                          [scm_cv_struct_ip_mreq="yes"],
+                          [scm_cv_struct_ip_mreq="no"]))
+AC_MSG_RESULT($scm_cv_struct_ip_mreq)
+if test $scm_cv_struct_ip_mreq = yes; then
+        AC_DEFINE([HAVE_STRUCT_IP_MREQ], 1,
+          [Define this if your system defines struct ip_mreq, for use with the
+          setsockopt system call.])
+fi

 GUILE_HEADER_LIBC_WITH_UNISTD

-- 
1.7.2.3