Don't allow the gender property to be set in language files (they are only relevant in voice files).

espeak-ng-data/lang/aav/vi

 name Vietnamese (Northern)
 language vi
-gender male
 
 words 1
 pitch 80 118

espeak-ng-data/lang/aav/vi-VN-x-central

 language vi-vn-x-central
 phonemes vi-hue
 dictrules 1
-gender male
 
 words 1
 pitch 82 118   //80 118

espeak-ng-data/lang/aav/vi-VN-x-south

 language vi-vn-x-south
 phonemes vi-sgn
 dictrules 2
-gender male
 
 words 1
 pitch 82 118   //80 118

espeak-ng-data/lang/art/eo

 name Esperanto
 language eo
-gender male
 
 apostrophe 2

espeak-ng-data/lang/art/lfn

 name Lingua Franca Nova
 language lfn
-gender male
 
 phonemes base2
 l_unpronouncable 0

espeak-ng-data/lang/azc/nci

 name Nahuatl (Classical)
 language nci
-gender male
 
 intonation 3
 stressrule 2

espeak-ng-data/lang/bat/lt

 name Lithuanian
 language lt
-gender male
-

espeak-ng-data/lang/bat/lv

 name Latvian
 language lv
-gender male
 maintainer Valdis Vitolins <valdis.vitolins@odo.lv>
 status mature
 words 0 2

espeak-ng-data/lang/bnt/sw

 name Swahili
 language sw
-gender male
 
 status testing

espeak-ng-data/lang/bnt/tn

 name Setswana
 language tn
-gender male
 
 status testing

espeak-ng-data/lang/cel/cy

 name Welsh
 language cy
-gender male
 
 intonation 4

espeak-ng-data/lang/dra/ml

 name Malayalam
 language ml
-gender male
 
 intonation 2
 //consonants 80

espeak-ng-data/lang/dra/ta

 name Tamil
 language ta
-gender male
 
 intonation 2
 consonants 80

espeak-ng-data/lang/gmq/da

 name Danish
 language da
-gender male
 
 tunes s2 c2 q2 e2
-
-

espeak-ng-data/lang/gmq/is

 name Icelandic
 language is
-gender male
-

espeak-ng-data/lang/gmq/no

 name Norwegian
 language no
 language nb
-gender male
 
 intonation 4

espeak-ng-data/lang/gmq/sv

 name Swedish
 language sv
-gender male
-

espeak-ng-data/lang/gmw/af

 name Afrikaans
 language af
-gender male
 
 maintainer Christo de Klerk <christodeklerk@gmail.com>
 status mature

espeak-ng-data/lang/gmw/de

 name German
 language de
-gender male
-
-

espeak-ng-data/lang/gmw/en

 name English (Great Britain)
 language en-gb  2
 language en 2
-gender male
 
 maintainer Reece H. Dunn <msclrhd@gmail.com>
 status mature

espeak-ng-data/lang/gmw/en-029

 name English (Caribbean)
 language en-029
 language en 10
-gender male
 
 maintainer Reece H. Dunn <msclrhd@gmail.com>
 status mature

espeak-ng-data/lang/gmw/en-GB-scotland

 name English (Scotland)
 language en-gb-scotland
 language en 4
-gender male
 
 maintainer Reece H. Dunn <msclrhd@gmail.com>
 status mature

espeak-ng-data/lang/gmw/en-GB-x-gbclan

 language en-gb-x-gbclan
 language en-gb  3
 language en 5
-gender male
 
 maintainer Reece H. Dunn <msclrhd@gmail.com>
 status mature
 replace 00 i@3 i@
 replace 03 N n
 replace 03 i  I2
-
-

espeak-ng-data/lang/gmw/en-GB-x-gbcwmd

 language en-gb-x-gbcwmd
 language en-gb 9
 language en 9
-gender male
 
 phonemes en-wm
 

espeak-ng-data/lang/gmw/en-GB-x-rp

 language en-gb-x-rp
 language en-gb  4
 language en 5
-gender male
 
 maintainer Reece H. Dunn <msclrhd@gmail.com>
 status mature

espeak-ng-data/lang/gmw/en-US

 name English (America)
 language en-us 2
 language en 3
-gender male
 
 maintainer Reece H. Dunn <msclrhd@gmail.com>
 status mature
 
 replace 03 I  i
 replace 03 I2 i
-

espeak-ng-data/lang/gmw/nl

 name Dutch
 language nl
-gender male

espeak-ng-data/lang/grk/el

 name Greek (Modern)
 language el
-gender male
-
-

espeak-ng-data/lang/grk/grc

 name Greek (Ancient)
 language grc
-gender male
 
 stressLength 170 170  190 190  0 0  230 240
 dictrules 1
 words 3
-

espeak-ng-data/lang/inc/bn

 name Bengali
 language bn
-gender male

espeak-ng-data/lang/inc/hi

 name Hindi
 language hi
-gender male

espeak-ng-data/lang/inc/ne

 name Nepali
 language ne
-gender male
 
 dictrules 1

espeak-ng-data/lang/ine/hy

 name Armenian (East Armenia)
 language hy
-gender male

espeak-ng-data/lang/ine/hy-arevmda

 name Armenian (West Armenia)
 language hy-arevmda
 language hy  8
-gender male
 
 dictrules 1
 
 replace 00 k  g
 
 replace 00 R2 R  // ??
-

espeak-ng-data/lang/ine/sq

 name Albanian
 language sq
-gender male
 
 // add this line to remove 'ë' at the end of words
 // replace 00  @/  NULL

espeak-ng-data/lang/ira/ku

 name Kurdish
 language ku
-gender male
 
 //words 1 48
 

espeak-ng-data/lang/itc/la

 name Latin
 language la
-gender male
 stressrule 2 33 0 2
 // rule=penultimate
 // flags=0100001 (no automatic secondary stress + don't stres monosyllables)

espeak-ng-data/lang/jpx/jp

 name Japanese
 language jp
 phonemes jp
-gender male
 
 intonation 4

espeak-ng-data/lang/ko

 name Korean
 language ko
-gender male
 pitch 80 118
 intonation 2
 

espeak-ng-data/lang/poz/id

 name Indonesian
 language id
-gender male
 
 stressLength 160 200  180 180  0 0  220 240
 stressAmp    16  18   18  18   0 0  22  21

espeak-ng-data/lang/poz/ms

 // Last updated: 14 October 2010, Jason Ong (jason@portalgroove.com)
 name Malay
 language ms
-gender male
 phonemes id
 
 translator id

espeak-ng-data/lang/roa/an

 name Aragonese
 language an
-gender male

espeak-ng-data/lang/roa/ca

 name Catalan
 language ca
-gender male
-

espeak-ng-data/lang/roa/es

 name Spanish (Spain)
 language es
-gender male
 dictrules 1
 tunes s6 c6 q6 e6

espeak-ng-data/lang/roa/es-419

 language es-419
 language es-mx 6
 language es 6
-gender male
 
 phonemes es-la
 dictrules 2

espeak-ng-data/lang/roa/fr

 name French (France)
 language fr-fr
 language fr
-gender male
 
 dictrules 1
 tunes s3 c3 q3 e3

espeak-ng-data/lang/roa/fr-BE

 name French (Belgium)
 language fr-be
 language fr 8
-gender male
 
 dictrules 2
 tunes s3 c3 q3 e3

espeak-ng-data/lang/roa/it

 name Italian
 language it
-gender male
 
 maintainer Christian Leo M <llajta2012@gmail.com>
 status mature
 
 tunes s4 c4 q4 e4
-

espeak-ng-data/lang/roa/pt-BR

 name Portuguese (Brazil)
 language pt-br
 language pt
-gender male
 
 dictrules 2
 stressLength 200 115 230 230 0 0 250 270

espeak-ng-data/lang/roa/pt-PT

 name Portuguese (Portugal)
 language pt-pt
 language pt 6
-gender male
 phonemes pt-pt
 
 dictrules 1

espeak-ng-data/lang/roa/ro

 name Romanian
 language ro
-gender male

espeak-ng-data/lang/sem/ar

 name Arabic
 language ar
 phonemes ar
-gender male
 pitch 160 120
 roughness 0
 speed 70

espeak-ng-data/lang/sit/cmn

 name Chinese (Mandarin)
 language zh
-gender male
 words 1
 pitch 80 118
 

espeak-ng-data/lang/sit/yue

 translator zhy
 phonemes zhy
 dictionary zhy
-gender male
 
 // interpret English letters as 1=English words, 2=jyutping
 dictrules 1

espeak-ng-data/lang/trk/tr

 name Turkish
 language tr
-gender male
-

espeak-ng-data/lang/trk/tt

 name Tatar
 language tt
-gender male

espeak-ng-data/lang/urj/fi

 name Finnish
 language fi
-gender male
-

espeak-ng-data/lang/urj/hu

 name Hungarian
 language hu
-gender male
 option bracket 0 0
 pitch 81 117
 

espeak-ng-data/lang/zls/bs

 language bs
 phonemes hr
 dictionary hbs
-gender male
 
 pitch 81 120
 formant 0 100 100 100

espeak-ng-data/lang/zls/cs

 name Czech
 language cs
-gender male
-

espeak-ng-data/lang/zls/hr

 name Croatian
 language hr
 language hbs
-gender male
 
 dictionary hbs
 

espeak-ng-data/lang/zls/mk

 name Macedonian
 language mk
-gender male
-

espeak-ng-data/lang/zls/pl

 name Polish
 language pl
-gender male
 
 intonation 2

espeak-ng-data/lang/zls/ru

 name Russian
 language ru
-gender male
 
 replace 03 a a#
 

espeak-ng-data/lang/zls/sk

 name Slovak
 language sk
-gender male
-

espeak-ng-data/lang/zls/sr

 name Serbian
 language sr
-gender male
 dictionary hbs
 
 // attributes towards !variant3 pitch 80 120

src/libespeak-ng/voices.c

 	       &tone_pts[8], &tone_pts[9]);
 }
 
-static espeak_VOICE *ReadVoiceFile(FILE *f_in, const char *fname)
+static espeak_VOICE *ReadVoiceFile(FILE *f_in, const char *fname, int is_language_file)
 {
 	// Read a Voice file, allocate a VOICE_DATA and set data from the
 	// file's  language, gender, name  lines
 			break;
 		case V_GENDER:
 			sscanf(p, "%s %d", vgender, &age);
+			if (is_language_file)
+				fprintf(stderr, "Error (%s): gender attribute specified on a language file\n", fname);
 			break;
 		case V_VARIANTS:
 			sscanf(p, "%d", &n_variants);
 	return vp->identifier;
 }
 
-static void GetVoices(const char *path, int len_path_voices)
+static void GetVoices(const char *path, int len_path_voices, int is_language_file)
 {
 	FILE *f_voice;
 	espeak_VOICE *voice_data;
 
 			if (ftype == -EISDIR) {
 				// a sub-directory
-				GetVoices(fname, len_path_voices);
+				GetVoices(fname, len_path_voices, is_language_file);
 			} else if (ftype > 0) {
 				// a regular file, add it to the voices list
 				if ((f_voice = fopen(fname, "r")) == NULL)
 					continue;
 
 				// pass voice file name within the voices directory
-				voice_data = ReadVoiceFile(f_voice, fname+len_path_voices);
+				voice_data = ReadVoiceFile(f_voice, fname+len_path_voices, is_language_file);
 				fclose(f_voice);
 
 				if (voice_data != NULL)
 
 		if (ftype == -EISDIR) {
 			// a sub-directory
-			GetVoices(fname, len_path_voices);
+			GetVoices(fname, len_path_voices, is_language_file);
 		} else if (ftype > 0) {
 			// a regular file, add it to the voices list
 			if ((f_voice = fopen(fname, "r")) == NULL)
 				continue;
 
 			// pass voice file name within the voices directory
-			voice_data = ReadVoiceFile(f_voice, fname+len_path_voices);
+			voice_data = ReadVoiceFile(f_voice, fname+len_path_voices, is_language_file);
 			fclose(f_voice);
 
 			if (voice_data != NULL)
 	FreeVoiceList();
 
 	sprintf(path_voices, "%s%cvoices", path_home, PATHSEP);
-	GetVoices(path_voices, strlen(path_voices)+1);
+	GetVoices(path_voices, strlen(path_voices)+1, 0);
 
 	sprintf(path_voices, "%s%clang", path_home, PATHSEP);
-	GetVoices(path_voices, strlen(path_voices)+1);
+	GetVoices(path_voices, strlen(path_voices)+1, 1);
 
 	voices_list[n_voices_list] = NULL; // voices list terminator
 	espeak_VOICE **new_voices = (espeak_VOICE **)realloc(voices, sizeof(espeak_VOICE *)*(n_voices_list+1));