build: Check for linux/if_alg.h if tools are enabled

diff --git a/configure.ac b/configure.ac
index 06ac210..fa91a9c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -392,6 +392,9 @@ if (test "${enable_tools}" = "yes"); then
                                AC_MSG_ERROR(GnuTLS library is required))
        AC_SUBST(GNUTLS_CFLAGS)
        AC_SUBST(GNUTLS_LIBS)
+
+       AC_CHECK_HEADERS(linux/if_alg.h, dummy=yes,
+               AC_MSG_ERROR(User-space algorithm header files are required))
 fi
 AM_CONDITIONAL(TOOLS, test "${enable_tools}" = "yes")