Bug: https://bugs.gentoo.org/926464

--- a/client/menu.c
+++ b/client/menu.c
@@ -1402,8 +1402,8 @@
 */
 static int credits_start_time;
 static const char **credits;
-static char *creditsIndex[256];
-static char *creditsBuffer;
+static const char *creditsIndex[256];
+static void *creditsBuffer;
 static const char *idcredits[] =
 {
 	"+QUAKE II BY ID SOFTWARE",
@@ -2603,7 +2603,7 @@
 	s_startmap_list.generic.x	= 0;
 	s_startmap_list.generic.y	= 0;
 	s_startmap_list.generic.name	= "initial map";
-	s_startmap_list.itemnames = mapnames;
+	s_startmap_list.itemnames = (const char **) mapnames;
 
 	s_rules_box.generic.type = MTYPE_SPINCONTROL;
 	s_rules_box.generic.x	= 0;
@@ -3395,7 +3395,7 @@
 
 static void ModelCallback( void *unused )
 {
-	s_player_skin_box.itemnames = s_pmi[s_player_model_box.curvalue].skindisplaynames;
+	s_player_skin_box.itemnames = (const char **) s_pmi[s_player_model_box.curvalue].skindisplaynames;
 	s_player_skin_box.curvalue = 0;
 }
 
@@ -3684,7 +3684,7 @@
 	s_player_model_box.generic.callback = ModelCallback;
 	s_player_model_box.generic.cursor_offset = -48;
 	s_player_model_box.curvalue = currentdirectoryindex;
-	s_player_model_box.itemnames = s_pmnames;
+	s_player_model_box.itemnames = (const char **) s_pmnames;
 
 	s_player_skin_title.generic.type = MTYPE_SEPARATOR;
 	s_player_skin_title.generic.name = "skin";
@@ -3698,7 +3698,7 @@
 	s_player_skin_box.generic.callback = 0;
 	s_player_skin_box.generic.cursor_offset = -48;
 	s_player_skin_box.curvalue = currentskinindex;
-	s_player_skin_box.itemnames = s_pmi[currentdirectoryindex].skindisplaynames;
+	s_player_skin_box.itemnames = (const char **) s_pmi[currentdirectoryindex].skindisplaynames;
 
 	s_player_hand_title.generic.type = MTYPE_SEPARATOR;
 	s_player_hand_title.generic.name = "handedness";
--- a/ctf/g_items.c
+++ b/ctf/g_items.c
@@ -2211,7 +2211,7 @@
 		"item_flag_team1",
 		CTFPickup_Flag,
 		NULL,
-		CTFDrop_Flag, //Should this be null if we don't want players to drop it manually?
+		NULL,
 		NULL,
 		"ctf/flagtk.wav",
 		"players/male/flag1.md2", EF_FLAG1,
@@ -2234,7 +2234,7 @@
 		"item_flag_team2",
 		CTFPickup_Flag,
 		NULL,
-		CTFDrop_Flag, //Should this be null if we don't want players to drop it manually?
+		NULL,
 		NULL,
 		"ctf/flagtk.wav",
 		"players/male/flag2.md2", EF_FLAG2,
--- a/game/m_boss31.c
+++ b/game/m_boss31.c
@@ -28,7 +28,7 @@
 #include "g_local.h"
 #include "m_boss31.h"
 
-extern SP_monster_makron (edict_t *self);
+extern void SP_monster_makron (edict_t *self);
 qboolean visible (edict_t *self, edict_t *other);
 
 static int	sound_pain1;
--- a/game/q_shared.h
+++ b/game/q_shared.h
@@ -32,6 +32,7 @@
 #endif
 
 #include <assert.h>
+#include <ctype.h>
 #include <math.h>
 #include <stdio.h>
 #include <stdarg.h>
--- a/linux/net_udp.c
+++ b/linux/net_udp.c
@@ -25,6 +25,7 @@
 #include <sys/socket.h>
 #include <sys/time.h>
 #include <netinet/in.h>
+#include <arpa/inet.h>
 #include <netdb.h>
 #include <sys/param.h>
 #include <sys/ioctl.h>
--- a/linux/q_shlinux.c
+++ b/linux/q_shlinux.c
@@ -23,6 +23,12 @@
 #include <stdio.h>
 #include <dirent.h>
 #include <unistd.h>
+#ifndef __USE_GNU /* mremap(2) + glibc */
+#define __USE_GNU
+#endif
+#ifndef _GNU_SOURCE /* mremap(2) + musl */
+#define _GNU_SOURCE
+#endif
 #include <sys/mman.h>
 #include <sys/time.h>
 
--- a/linux/snd_linux.c
+++ b/linux/snd_linux.c
@@ -54,7 +54,7 @@
 	extern uid_t saved_euid;
 
 	if (snd_inited)
-		return;
+		return 0;
 
 	if (!snddevice) {
 		sndbits = Cvar_Get("sndbits", "16", CVAR_ARCHIVE);
--- a/linux/rw_x11.c
+++ b/linux/rw_x11.c
@@ -33,6 +33,7 @@
 */
 
 #include <ctype.h>
+#include <sys/mman.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <unistd.h>