c++ - How to get rid of libcurl linking error? -

i using libcurl version 7.19 in cpp application. trying use example given kukuruku.co. when try build application getting following errror,

lib/libcurl.a(libcurl_la-http_negotiate.o): in function `cleanup':     http_negotiate.c:(.text+0x1b): undefined reference `gss_delete_sec_context'     http_negotiate.c:(.text+0x30): undefined reference `gss_release_buffer'     http_negotiate.c:(.text+0x45): undefined reference `gss_release_name'  lib/libcurl.a(libcurl_la-http_negotiate.o): in function `curl_output_negotiate':     http_negotiate.c:(.text+0x123): undefined reference `gss_release_buffer'     http_negotiate.c:(.text+0x1c0): undefined reference `gss_release_buffer'  lib/libcurl.a(libcurl_la-http_negotiate.o): in function `curl_input_negotiate':     http_negotiate.c:(.text+0x324): undefined reference `gss_c_nt_hostbased_service'     http_negotiate.c:(.text+0x33a): undefined reference `gss_import_name'     http_negotiate.c:(.text+0x48e): undefined reference `gss_release_buffer'     http_negotiate.c:(.text+0x4cc): undefined reference `gss_release_buffer' 

here code snippet using ,

#include <stdio.h> #include <curl/curl.h>  int main(void) {   curl *curl;   curlcode res;    curl = curl_easy_init();   if(curl) {     curl_easy_setopt(curl, curlopt_url, "http://example.com");     /* example.com redirected, tell libcurl follow redirection */      curl_easy_setopt(curl, curlopt_followlocation, 1l);      /* perform request, res return code */      res = curl_easy_perform(curl);     /* check errors */      if(res != curle_ok)       fprintf(stderr, "curl_easy_perform() failed: %s\n",               curl_easy_strerror(res));      /* cleanup */      curl_easy_cleanup(curl);   }   return 0; } 

my makefile looks this,

  ccflags = -g -wall -pthread -d_largefile_source -d_file_offset_bits=64 -d__stdc_format_macros -d__stdc_limit_macros -duse_apache2 -fno-strict-aliasing -fmessage-length=0 -fpic -    o0 -ftemplate-depth-32 -fno-operator-names -d_gnu_source -d_gss_c_nt_hostbased_service    cflags += `pkg-config --cflags libcurl`   ldflags += `pkg-config --libs libcurl`   #dcmake_build_type=release   #libs += -libcurl 

i use module.mk file target,

app_objects = \         app-client/app-client-cmd.o \     $(null) 

could me on this?

you should provide linker options, e.g.

gcc -wall -o2 -g -lcurl -o test main.cpp 

or use pkg-config. in linux shell may following:

gcc -wall -o2 -g $(pkg-config --libs --cflags libcurl) -o test main.cpp 

update: static linking

as @drew010 suggested, can generate proper linker options curl-config:

cc=$(curl-config --cc) $cc -wall -g -o2 main.cpp $(curl-config --static-libs) -o mytest 

update: added makefile , cmake examples

using makefile

cc = gcc cflags = -wall -g -o2 ldflags =  executable = mytest sources = main.cpp  cflags += `pkg-config --cflags libcurl` ldflags += `pkg-config --libs libcurl`   all: $(executable)   $(executable): $(sources)   $(cc) $(sources) -o $@ $(ldflags)   .cpp.o:   $(cc) $(cflags) $< -o $@   clean:   rm -f $(objects) $(executable) 

using cmake

cmake_minimum_required (version 2.6) project (myproject cxx) set(cmake_build_type "release")  include_directories("${cmake_current_source_dir}") set(cmake_runtime_output_directory "${cmake_binary_dir}/bin")  include(findcurl) find_package(curl required)  if (not curl_found)   message (fatal_error "curl not supported") endif (not curl_found)  include_directories(curl_include_dirs)  set(cmake_required_libraries "${curl_libraries}") list(append libs "${curl_libraries}")  set(target "mytest") add_executable(${target} main.cpp) target_link_libraries(${target} ${libs})  install(targets ${target} destination "bin")