make all headers (almost) self-contained by using include guards and #include statements within headers

src/libespeak-ng/compiledict.c

 
 #include <ctype.h>
 #include <errno.h>
+#include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>

src/libespeak-ng/error.h

 #ifndef ESPEAK_NG_ERROR_API
 #define ESPEAK_NG_ERROR_API
 
+#include <espeak-ng/espeak_ng.h>
+
 #ifdef __cplusplus
 extern "C"
 {

src/libespeak-ng/espeak_command.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ESPEAK_COMMAND_H
-#define ESPEAK_COMMAND_H
+#ifndef ESPEAK_NG_COMMAND_H
+#define ESPEAK_NG_COMMAND_H
+
+#include <espeak-ng/espeak_ng.h>
 
 #ifdef __cplusplus
 extern "C"

src/libespeak-ng/event.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
-#ifndef EVENT_H
-#define EVENT_H
-
 /*
    Manage events (sentence, word, mark, end,...), is responsible of calling the external
    callback as soon as the relevant audio sample is played.
 
  */
 
+#ifndef ESPEAK_NG_EVENT_H
+#define ESPEAK_NG_EVENT_H
+
+#include <espeak-ng/espeak_ng.h>
+
 #ifdef __cplusplus
 extern "C"
 {

src/libespeak-ng/fifo.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
-#ifndef FIFO_H
-#define FIFO_H
-
 // Helps to add espeak commands in a first-in first-out queue
 // and run them asynchronously.
 
+#ifndef ESPEAK_NG_FIFO_H
+#define ESPEAK_NG_FIFO_H
+
+#include <espeak-ng/espeak_ng.h>
+#include "espeak_command.h"
+
 #ifdef __cplusplus
 extern "C"
 {

src/libespeak-ng/ieee80.h

  * conversions, and accommodated conversions involving +/- infinity,
  * NaN's, and denormalized numbers.
  */
+
 #ifndef IEEE_H
 #define IEEE_H
 

src/libespeak-ng/klatt.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
+#ifndef ESPEAK_NG_KLATT_H
+#define ESPEAK_NG_KLATT_H
+
+#include "speech.h"
+#include "synthesize.h"
+
 #ifdef __cplusplus
 extern "C"
 {
 #ifdef __cplusplus
 }
 #endif
+
+#endif

src/libespeak-ng/phoneme.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
+#ifndef ESPEAK_NG_PHONEME_H
+#define ESPEAK_NG_PHONEME_H
+
+#include <espeak-ng/espeak_ng.h>
+
 #ifdef __cplusplus
 extern "C"
 {
 #ifdef __cplusplus
 }
 #endif
+
+#endif

src/libespeak-ng/sintab.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
+#ifndef ESPEAK_NG_SINTAB_H
+#define ESPEAK_NG_SINTAB_H
+
 #ifdef __cplusplus
 extern "C"
 {
 #ifdef __cplusplus
 }
 #endif
+
+#endif

src/libespeak-ng/spect.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
+#ifndef ESPEAK_NG_SPECT_H
+#define ESPEAK_NG_SPECT_H
+
+#include <espeak-ng/espeak_ng.h>
+#include "synthesize.h"
+#include "speech.h"
+
 #ifdef __cplusplus
 extern "C"
 {
 #ifdef __cplusplus
 }
 #endif
+
+#endif

src/libespeak-ng/speech.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
-#ifndef SPEECH_H
-#define SPEECH_H
+#ifndef ESPEAK_NG_SPEECH_H
+#define ESPEAK_NG_SPEECH_H
+
+#include <espeak-ng/espeak_ng.h>
 
 #ifdef __cplusplus
 extern "C"

src/libespeak-ng/ssml.h

 #ifndef ESPEAK_NG_SSML_API
 #define ESPEAK_NG_SSML_API
 
+#include <stdbool.h>
+#include <wchar.h>
+
+#include <espeak-ng/speak_lib.h>
+
 #ifdef __cplusplus
 extern "C"
 {

src/libespeak-ng/synthesize.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
-#include <stdbool.h>
+#ifndef ESPEAK_NG_SYNTHESIZE_H
+#define ESPEAK_NG_SYNTHESIZE_H
+
+#include "speech.h"
 
 #ifdef __cplusplus
 extern "C"
 {
 #endif
 
+#include <stdint.h>
+#include <stdbool.h>
+#include <espeak-ng/espeak_ng.h>
+#include "phoneme.h"
+#include "voice.h"
+
 #define espeakINITIALIZE_PHONEME_IPA 0x0002 // move this to speak_lib.h, after eSpeak version 1.46.02
 
 #define N_PHONEME_LIST 1000 // enough for source[N_TR_SOURCE] full of text, else it will truncate
 #ifdef __cplusplus
 }
 #endif
+
+#endif

src/libespeak-ng/translate.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
+#ifndef ESPEAK_NG_TRANSLATE_H
+#define ESPEAK_NG_TRANSLATE_H
+
+#include <stdbool.h>
+
+#include <espeak-ng/espeak_ng.h>
+#include <espeak-ng/encoding.h>
+
+#include "synthesize.h"
+
 #ifdef __cplusplus
 extern "C"
 {
 #ifdef __cplusplus
 }
 #endif
+
+#endif

src/libespeak-ng/voice.h

  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
+#ifndef ESPEAK_NG_VOICE_H
+#define ESPEAK_NG_VOICE_H
+
+#include <espeak-ng/espeak_ng.h>
+
+#include "speech.h"
+
 #ifdef __cplusplus
 extern "C"
 {
 #ifdef __cplusplus
 }
 #endif
+
+#endif

src/libespeak-ng/wavegen.c

 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>
 
+#include "synthesize.h"
 #include "speech.h"
 #include "phoneme.h"
 #include "voice.h"
-#include "synthesize.h"
 
 #ifdef INCLUDE_KLATT
 #include "klatt.h"