diff --git a/scconfig/src/default/find_cc.c b/scconfig/src/default/find_cc.c
index f2b9d700..83adf40d 100644
--- a/scconfig/src/default/find_cc.c
+++ b/scconfig/src/default/find_cc.c
@@ -747,6 +747,9 @@ static const char *test_host =
 		NL "#include <stdlib.h>"
 		NL "#include <stdio.h>"
 		NL "#include %s"
+		NL "#ifndef RTLD_NOW"
+		NL "#define RTLD_NOW RTLD_LAZY" /* on old BSD and probably on SunOS */
+		NL "#endif"
 		NL "int main() {"
 		NL "	void *handle = NULL;"
 		NL "	void (*func)() = NULL;"
diff --git a/scconfig/src/default/find_libs.c b/scconfig/src/default/find_libs.c
index 6f7d32c7..929690a4 100644
--- a/scconfig/src/default/find_libs.c
+++ b/scconfig/src/default/find_libs.c
@@ -59,6 +59,9 @@ int find_lib_ldl(const char *name, int logdepth, int fatal)
 	char *test_c =
 		NL "#include <stdio.h>"
 		NL "#include <dlfcn.h>"
+		NL "#ifndef RTLD_NOW"
+		NL "#define RTLD_NOW RTLD_LAZY" /* on old BSD and probably on SunOS */
+		NL "#endif"
 		NL "int main() {"
 		NL "	void *handle;"
 		NL "	handle = dlopen(\"/this file does not exist.\", RTLD_NOW);"
diff --git a/src/hilight.c b/src/hilight.c
index af8080be..3a84a42a 100644
--- a/src/hilight.c
+++ b/src/hilight.c
@@ -799,6 +799,10 @@ void propagate_hilights(int set)
   char *type;
 
   for(i = 0; i < xctx->instances; i++) {
+    if(xctx->inst[i].ptr < 0 ) {
+      dbg(0, "propagate_hilights(): .ptr < 0, unbound symbol: instance %d, name=%s\n", i, xctx->inst[i].instname);
+      continue;
+    }
     if(xctx->inst[i].color) hilights = 1; /* some hilight instances -> don't clear xctx->hilight_nets */
     type = (xctx->inst[i].ptr+ xctx->sym)->type;
     hilight_connected_inst = (xctx->inst[i].flags & 4) || ((xctx->inst[i].ptr+ xctx->sym)->flags & 4);