core: link with resolv library only on Mac OS X

This fixes build on FreeBSD.

configure.ac

@@ -55,6 +55,9 @@ netbsd*)
 solaris*)
         LDFLAGS="$LDFLAGS -lsocket -lxnet"
         ;;
+darwin*)
+        LDFLAGS="$LDFLAGS -lresolv"
+        ;;
 esac
 
 # Gettext

src/gui/curses/CMakeLists.txt

@@ -73,7 +73,10 @@ list(APPEND EXTRA_LIBS "m")
 
 list(APPEND EXTRA_LIBS ${CURL_LIBRARIES})
 
-list(APPEND EXTRA_LIBS "resolv")
+if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+  # link with resolv lib on Mac OS X
+  list(APPEND EXTRA_LIBS "resolv")
+endif()
 
 include_directories(.. ../../core ../../plugins ${NCURSES_INCLUDE_PATH})