title: Linking multiple .c files together in Android.mk
body: <p>How do i link up or "use" multiple .c files in the Android.mk file?</p>
  
  <p>It currently looks like this </p>
  
  <pre><code>LOCAL_PATH := $(call my-dir)
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := ndk_demo
  LOCAL_SRC_FILES := gnutls-3.0.12/lib/debug.c
  include $(BUILD_SHARED_LIBRARY)
  </code></pre>
  
  <p>However, when i try and ndk-build it, it always throws this error</p>
  
  <pre><code>Compile thumb  : ndk_demo &lt;= debug.c
  In file included from jni/gnutls-3.0.12/lib/debug.c:25:
  jni/gnutls-3.0.12/lib/gnutls_int.h:52:43: error: u64.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_int.h:57:24: error: gl/memxor.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_int.h:84:27: error: gnutls/gnutls.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_int.h:85:29: error: gnutls/abstract.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_int.h:86:20: error: system.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_int.h:202:24: error: gnutls_mem.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_int.h:219:24: error: gnutls_mpi.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_int.h:230:24: error: gnutls_str.h: No such file or directory
  In file included from jni/gnutls-3.0.12/lib/debug.c:25:
  jni/gnutls-3.0.12/lib/gnutls_int.h:276: error: expected specifier-qualifier-list before 'gnutls_handshake_description_t'
  jni/gnutls-3.0.12/lib/gnutls_int.h:307: error: expected specifier-qualifier-list before 'gnutls_datum_t'
  jni/gnutls-3.0.12/lib/gnutls_int.h:350: error: expected specifier-qualifier-list before 'gnutls_credentials_type_t'
  jni/gnutls-3.0.12/lib/gnutls_int.h:361: error: expected specifier-qualifier-list before 'gnutls_pk_params_st'
  jni/gnutls-3.0.12/lib/gnutls_int.h:418:29: error: gnutls_hash_int.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_int.h:419:31: error: gnutls_cipher_int.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_int.h:420:29: error: gnutls_compress.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_int.h:459: error: expected specifier-qualifier-list before 'gnutls_kx_algorithm_t'
  jni/gnutls-3.0.12/lib/gnutls_int.h:506: error: expected specifier-qualifier-list before 'gnutls_datum_t'
  jni/gnutls-3.0.12/lib/gnutls_int.h:527: error: expected specifier-qualifier-list before 'gnutls_cipher_algorithm_t'
  jni/gnutls-3.0.12/lib/gnutls_int.h:543: error: 'GNUTLS_MAX_ALGORITHM_NUM' undeclared here (not in a function)
  jni/gnutls-3.0.12/lib/gnutls_int.h:584: error: expected specifier-qualifier-list before 'bigint_t'
  jni/gnutls-3.0.12/lib/gnutls_int.h:591: error: expected specifier-qualifier-list before 'gnutls_dh_params_t'
  jni/gnutls-3.0.12/lib/gnutls_int.h:657: error: expected specifier-qualifier-list before 'gnutls_buffer_st'
  jni/gnutls-3.0.12/lib/gnutls_int.h:882: error: expected ')' before 'session'
  jni/gnutls-3.0.12/lib/gnutls_int.h:897: warning: parameter names (without types) in function declaration
  jni/gnutls-3.0.12/lib/gnutls_int.h:898: error: expected '=', ',', ';', 'asm' or '__attribute__' before '_gnutls_get_adv_version'
  jni/gnutls-3.0.12/lib/gnutls_int.h:903: error: expected '=', ',', ';', 'asm' or '__attribute__' before '_gnutls_protocol_get_version'
  jni/gnutls-3.0.12/lib/gnutls_int.h:911: error: expected ')' before 'session'
  In file included from jni/gnutls-3.0.12/lib/debug.c:26:
  jni/gnutls-3.0.12/lib/gnutls_errors.h:26:24: error: gnutls_int.h: No such file or directory
  jni/gnutls-3.0.12/lib/gnutls_errors.h:27:27: error: gnutls_global.h: No such file or directory
  In file included from jni/gnutls-3.0.12/lib/debug.c:26:
  jni/gnutls-3.0.12/lib/gnutls_errors.h:51: error: expected ')' before 'const'
  jni/gnutls-3.0.12/lib/gnutls_errors.h:58: error: expected declaration specifiers or '...' before 'bigint_t'
  In file included from jni/gnutls-3.0.12/lib/debug.c:29:
  jni/gnutls-3.0.12/lib/debug.h:24: error: expected ')' before 'handshake'
  jni/gnutls-3.0.12/lib/debug.h:25: error: expected declaration specifiers or '...' before 'bigint_t'
  jni/gnutls-3.0.12/lib/debug.c:67: error: expected ')' before 'handshake'
  make: *** [obj/local/armeabi/objs/ndk_demo/gnutls-3.0.12/lib/debug.o] Error 1
  </code></pre>
  
  <p>How do i include files like u64.h into the Android.mk so that it won't throw a No such file or directory error? Or am i going about this the wrong way?</p>