configure: Depend on libip4tc instead of libiptc

The libiptc meta-package apparently will be removed e.g. from Debian.
We currently only need IPv4 support in the connmark and forecast plugins.

Fixes #3338.

diff --git a/configure.ac b/configure.ac
index 1aa8cdcc0f2effb0f1923cc230d4e3738fa0de05..b0d5fcb8c78e1919c6ab62703daf5601a8b523a3 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1200,7 +1200,7 @@ if test x$xauth_pam = xtrue; then
 fi
 
 if test x$connmark = xtrue -o x$forecast = xtrue; then
-       PKG_CHECK_MODULES(libiptc, [libiptc])
+       PKG_CHECK_MODULES(libiptc, [libip4tc])
        AC_SUBST(libiptc_CFLAGS)
        AC_SUBST(libiptc_LIBS)
 fi