Add zookeeper library in Makefile template
diff --git a/templates/Makefile.template b/templates/Makefile.template
index f0cd0d9..7ff155d 100644
--- a/templates/Makefile.template
+++ b/templates/Makefile.template
@@ -423,6 +423,7 @@
 PROTOC_CHECK_VERSION_CMD = protoc --version | grep -q libprotoc.3
 DTRACE_CHECK_CMD = which dtrace > /dev/null
 SYSTEMTAP_HEADERS_CHECK_CMD = $(CC) $(CFLAGS) $(CPPFLAGS) -o $(TMPOUT) test/build/systemtap.c $(LDFLAGS)
+ZOOKEEPER_CHECK_CMD = $(CC) $(CFLAGS) $(CPPFLAGS) -o $(TMPOUT) test/build/zookeeper.c $(LDFLAGS) -lzookeeper_mt
 
 ifndef REQUIRE_CUSTOM_LIBRARIES_$(CONFIG)
 HAS_SYSTEM_PERFTOOLS = $(shell $(PERFTOOLS_CHECK_CMD) 2> /dev/null && echo true || echo false)
@@ -463,6 +464,8 @@
 endif
 endif
 
+HAS_ZOOKEEPER = $(shell $(ZOOKEEPER_CHECK_CMD) 2> /dev/null && echo true || echo false)
+
 ifeq ($(wildcard third_party/openssl/ssl/ssl.h),)
 HAS_EMBEDDED_OPENSSL_ALPN = false
 else
@@ -566,6 +569,14 @@
 PC_LIBS_PRIVATE = $(PC_LIBS_GRPC)
 GRPC_UNSECURE_PC_FILE := $(PC_TEMPLATE)
 
+# gprc_zookeeper .pc file
+PC_NAME = gRPC zookeeper
+PC_DESCRIPTION = gRPC's zookeeper plugin
+PC_CFLAGS =
+PC_REQUIRES_PRIVATE =
+PC_LIBS_PRIVATE = -lzookeeper_mt
+GRPC_ZOOKEEPER_PC_FILE := $(PC_TEMPLATE)
+
 PROTOBUF_PKG_CONFIG = false
 
 PC_REQUIRES_GRPCXX =
@@ -755,6 +766,7 @@
 	$(PERFTOOLS_CHECK_CMD) || true
 	$(PROTOBUF_CHECK_CMD) || true
 	$(PROTOC_CHECK_VERSION_CMD) || true
+	$(ZOOKEEPER_CHECK_CMD) || true
 
 $(LIBDIR)/$(CONFIG)/zlib/libz.a:
 	$(E) "[MAKE]    Building zlib"
@@ -815,10 +827,11 @@
 
 static_c: pc_c pc_c_unsecure \
 % for lib in libs:
-% if lib.build == 'all' and lib.language == 'c':
+% if lib.build == 'all' and lib.language == 'c' and not lib.get('external_deps', None):
  $(LIBDIR)/$(CONFIG)/lib${lib.name}.a\
 % endif
 % endfor
+ static_zookeeper_libs
 
 
 static_cxx: pc_cxx pc_cxx_unsecure pc_gpr\
@@ -833,11 +846,11 @@
 
 shared_c: pc_c pc_c_unsecure pc_gpr\
 % for lib in libs:
-% if lib.build == 'all' and lib.language == 'c':
+% if lib.build == 'all' and lib.language == 'c' and not lib.get('external_deps', None):
  $(LIBDIR)/$(CONFIG)/lib${lib.name}.$(SHARED_EXT)\
 % endif
 % endfor
-
+ shared_zookeeper_libs
 
 shared_cxx: pc_cxx pc_cxx_unsecure \
 % for lib in libs:
@@ -854,6 +867,29 @@
 % endif
 % endfor
 
+ifeq ($(HAS_ZOOKEEPER),true)
+static_zookeeper_libs:\
+% for lib in libs:
+% if lib.build == 'all' and lib.language == 'c' and 'zookeeper' in lib.get('external_deps', []):
+ $(LIBDIR)/$(CONFIG)/lib${lib.name}.a\
+% endif
+% endfor
+
+shared_zookeeper_libs:\
+% for lib in libs:
+% if lib.build == 'all' and lib.language == 'c' and 'zookeeper' in lib.get('external_deps', []):
+ $(LIBDIR)/$(CONFIG)/lib${lib.name}.$(SHARED_EXT)\
+% endif
+% endfor
+
+else
+
+static_zookeeper_libs:
+
+shared_zookeeper_libs:
+
+endif
+
 grpc_csharp_ext: shared_csharp
 
 plugins: $(PROTOC_PLUGINS)
@@ -1005,11 +1041,26 @@
 % for lib in libs:
 % if lib.language == "c++":
 % if lib.build == "all":
+% if not lib.get('external_deps', None):
 	$(E) "[STRIP]   Stripping lib${lib.name}.a"
 	$(Q) $(STRIP) $(LIBDIR)/$(CONFIG)/lib${lib.name}.a
 % endif
 % endif
+% endif
 % endfor
+
+ifeq ($(HAS_ZOOKEEPER),true)
+% for lib in libs:
+% if lib.language == "c++":
+% if lib.build == "all":
+% if 'zookeeper' in lib.get('external_deps', []):
+  $(E) "[STRIP]   Stripping lib${lib.name}.a"
+  $(Q) $(STRIP) $(LIBDIR)/$(CONFIG)/lib${lib.name}.a
+% endif
+% endif
+% endif
+% endfor
+endif
 endif
 
 strip-shared_c: shared_c
@@ -1017,11 +1068,25 @@
 % for lib in libs:
 % if lib.language == "c":
 % if lib.build == "all":
+% if not lib.get('external_deps', None):
 	$(E) "[STRIP]   Stripping lib${lib.name}.so"
 	$(Q) $(STRIP) $(LIBDIR)/$(CONFIG)/lib${lib.name}.$(SHARED_EXT)
 % endif
 % endif
+% endif
 % endfor
+ifeq ($(HAS_ZOOKEEPER),true)
+% for lib in libs:
+% if lib.language == "c":
+% if lib.build == "all":
+% if 'zookeeper' in lib.get('external_deps', []):
+	$(E) "[STRIP]   Stripping lib${lib.name}.so"
+	$(Q) $(STRIP) $(LIBDIR)/$(CONFIG)/lib${lib.name}.$(SHARED_EXT)
+% endif
+% endif
+% endif
+% endfor
+endif
 endif
 
 strip-shared_cxx: shared_cxx
@@ -1063,6 +1128,11 @@
 	$(Q) mkdir -p $(@D)
 	$(Q) echo -e "$(GRPC_UNSECURE_PC_FILE)" >$@
 
+$(LIBDIR)/$(CONFIG)/pkgconfig/grpc_zookeeper.pc:
+	$(E) "[MAKE]    Generating $@"
+	$(Q) mkdir -p $(@D)
+	$(Q) echo -e "$(GRPC_ZOOKEEPER_PC_FILE)" >$@
+
 $(LIBDIR)/$(CONFIG)/pkgconfig/grpc++.pc:
 	$(E) "[MAKE]    Generating $@"
 	$(Q) mkdir -p $(@D)
@@ -1151,12 +1221,27 @@
 % for lib in libs:
 % if lib.language == "c":
 % if lib.build == "all":
+% if not lib.get('external_deps', None):
 	$(E) "[INSTALL] Installing lib${lib.name}.a"
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/lib${lib.name}.a $(prefix)/lib/lib${lib.name}.a
 % endif
 % endif
+% endif
 % endfor
+ifeq ($(HAS_ZOOKEEPER),true)
+% for lib in libs:
+% if lib.language == "c":
+% if lib.build == "all":
+% if 'zookeeper' in lib.get('external_deps', []):
+	$(E) "[INSTALL] Installing lib${lib.name}.a"
+	$(Q) $(INSTALL) -d $(prefix)/lib
+	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/lib${lib.name}.a $(prefix)/lib/lib${lib.name}.a
+% endif
+% endif
+% endif
+% endfor
+endif
 
 install-static_cxx: static_cxx strip-static_cxx install-pkg-config_cxx
 % for lib in libs:
@@ -1173,6 +1258,7 @@
 % for lib in libs:
 % if lib.language == lang_filter:
 % if lib.build == "all":
+% if not lib.get('external_deps', None):
 ifeq ($(SYSTEM),MINGW32)
 	$(E) "[INSTALL] Installing ${lib.name}.$(SHARED_EXT)"
 	$(Q) $(INSTALL) -d $(prefix)/lib
@@ -1189,7 +1275,32 @@
 endif
 % endif
 % endif
+% endif
 % endfor
+ifeq ($(HAS_ZOOKEEPER),true)
+% for lib in libs:
+% if lib.language == lang_filter:
+% if lib.build == "all":
+% if 'zookeeper' in lib.get('external_deps', []):
+ifeq ($(SYSTEM),MINGW32)
+	$(E) "[INSTALL] Installing ${lib.name}.$(SHARED_EXT)"
+	$(Q) $(INSTALL) -d $(prefix)/lib
+	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/${lib.name}.$(SHARED_EXT) $(prefix)/lib/${lib.name}.$(SHARED_EXT)
+	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/lib${lib.name}-imp.a $(prefix)/lib/lib${lib.name}-imp.a
+else
+	$(E) "[INSTALL] Installing lib${lib.name}.$(SHARED_EXT)"
+	$(Q) $(INSTALL) -d $(prefix)/lib
+	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/lib${lib.name}.$(SHARED_EXT) $(prefix)/lib/lib${lib.name}.$(SHARED_EXT)
+ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf lib${lib.name}.$(SHARED_EXT) $(prefix)/lib/lib${lib.name}.so.${settings.version.major}
+	$(Q) ln -sf lib${lib.name}.$(SHARED_EXT) $(prefix)/lib/lib${lib.name}.so
+endif
+endif
+% endif
+% endif
+% endif
+% endfor
+endif
 ifneq ($(SYSTEM),MINGW32)
 ifneq ($(SYSTEM),Darwin)
 	$(Q) ldconfig || true
@@ -1225,6 +1336,7 @@
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/pkgconfig/gpr.pc $(prefix)/lib/pkgconfig/gpr.pc
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/pkgconfig/grpc.pc $(prefix)/lib/pkgconfig/grpc.pc
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/pkgconfig/grpc_unsecure.pc $(prefix)/lib/pkgconfig/grpc_unsecure.pc
+	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/pkgconfig/grpc_zookeeper.pc $(prefix)/lib/pkgconfig/grpc_zookeeper.pc
 
 install-pkg-config_cxx: pc_cxx pc_cxx_unsecure
 	$(E) "[INSTALL] Installing C++ pkg-config files"
@@ -1414,6 +1526,9 @@
     for src in lib.src:
       sources_that_don_t_need_openssl.add(src)
 
+  if 'zookeeper' in lib.get('external_deps', []):
+    libs = libs + ' -lzookeeper_mt'
+
   if lib.get('secure', 'check') == 'yes' or lib.get('secure', 'check') == 'check':
     lib_deps = lib_deps + ' $(OPENSSL_DEP)'
     mingw_lib_deps = mingw_lib_deps + ' $(OPENSSL_DEP)'