Fix builds on BSD host systems

makefile

@@ -61,7 +61,7 @@ ifeq ($(WIN32),)  #*nix Environments (&& cygwin)
           endif
         else
           LDSEARCH :=$(shell ldconfig -r | grep 'search directories' | awk '{print $$3}' | sed 's/:/ /g')
-          ifneq (,$(LDSEARCH)
+          ifneq (,$(LDSEARCH))
             LIBPATH := $(LDSEARCH)
           endif
           ifeq (usrpkglib,$(shell if $(TEST) -d /usr/pkg/lib; then echo usrpkglib; fi))

sim_ether.c

@@ -961,7 +961,12 @@ void pcap_close(pcap_t* a) {
   }
 }
 
+/* OpenBSD has an ancient declaration of pcap_compile which doesn't have a const in the bpf string argument */
+#if defined (__OpenBSD__)
+int pcap_compile(pcap_t* a, struct bpf_program* b, char* c, int d, bpf_u_int32 e) {
+#else
 int pcap_compile(pcap_t* a, struct bpf_program* b, const char* c, int d, bpf_u_int32 e) {
+#endif
   if (load_pcap() != 0) {
     return p_pcap_compile(a, b, c, d, e);
   } else {