Get a proper LD_LIBRARY_PATH to run the test suite

configure.ac

@@ -48,6 +48,10 @@ ac_default_prefix=$LIBVARNISHAPI_PREFIX
 AC_PATH_PROG([VARNISHTEST], [varnishtest], [], [$LIBVARNISHAPI_BINDIR:$PATH])
 AC_PATH_PROG([VARNISHD], [varnishd], [], [$LIBVARNISHAPI_SBINDIR:$PATH])
 
+PKG_CHECK_VAR([LIBVARNISHAPI_LIBDIR], [varnishapi], [libdir])
+AC_SUBST([VARNISH_LIBRARY_PATH],
+	[$LIBVARNISHAPI_LIBDIR:$LIBVARNISHAPI_LIBDIR/varnish])
+
 AC_CONFIG_FILES([
 	Makefile
 	src/Makefile

src/Makefile.am

@@ -26,6 +26,7 @@ vmod_example.man.rst vcc_if.c: vcc_if.h
 vcc_if.h: @VMODTOOL@ $(top_srcdir)/src/vmod_example.vcc
 	@PYTHON@ @VMODTOOL@ $(top_srcdir)/src/vmod_example.vcc
 
+AM_TESTS_ENVIRONMENT = LD_LIBRARY_PATH="$(VARNISH_LIBRARY_PATH)"
 VTC_LOG_COMPILER = $(VARNISHTEST) -v \
 	-Dvmod_topbuild=$(abs_top_builddir)
 TEST_EXTENSIONS = .vtc