build: check for missing feature files
linux/dccp.h is unlikely to be installed before 2.6.18 (which was
when headers_install was introduced), and does not exist at all
before 2.6.14. Add a compile-time check to skip compilation of
libxt_dccp in case this was detected.
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/configure.ac b/configure.ac
index e718eff..d063605 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,14 @@
AS_HELP_STRING([--enable-libipq], [Build and install libipq]))
AC_CHECK_HEADER([netinet/ip6.h], [], [AC_MSG_ERROR(but we need that for IPv6)])
+AC_CHECK_HEADER([linux/dccp.h])
+
+blacklist_modules="";
+if test "$ac_cv_header_linux_dccp_h" != "yes"; then
+ blacklist_modules="$blacklist_modules dccp";
+fi;
+AC_SUBST([blacklist_modules])
+
AM_CONDITIONAL([ENABLE_STATIC], [test "$enable_static" == "yes"])
AM_CONDITIONAL([ENABLE_SHARED], [test "$enable_shared" == "yes"])
AM_CONDITIONAL([ENABLE_DEVEL], [test "$enable_devel" == "yes"])