build: fix --disable-snmp

--disable-foo results in "no" as value in $enable_foo

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

diff --git a/configure.ac b/configure.ac
index 72f390c9d5871c8694fa2df371e17dc3858bcd90..be0329604f0e36f2c9c42900feedc01df0c17a03 100755 (executable)
--- a/configure.ac
+++ b/configure.ac
@@ -1315,7 +1315,7 @@ fi
 dnl ------------------
 dnl check Net-SNMP library
 dnl ------------------
-if test "${enable_snmp}" != ""; then
+if test "${enable_snmp}" != "" -a "${enable_snmp}" != "no"; then
    AC_PATH_TOOL([NETSNMP_CONFIG], [net-snmp-config], [no])
    if test x"$NETSNMP_CONFIG" = x"no"; then
       AC_MSG_ERROR([--enable-snmp given but unable to find net-snmp-config])