diff --git a/engine/client/cl_screen.c b/engine/client/cl_screen.c
index aa806aea..21826399 100644
--- a/engine/client/cl_screen.c
+++ b/engine/client/cl_screen.c
@@ -1771,7 +1771,9 @@ qboolean SCR_ScreenShot (char *filename)
 	int truewidth, trueheight;
 	qbyte            *buffer;
 	int                     i, c, temp;
+#if defined(AVAIL_PNGLIB) || defined(AVAIL_JPEGLIB)
 	extern cvar_t scr_sshot_compression;
+#endif
 
 #define MAX_PREPAD	128
 	char *ext;
diff --git a/engine/client/net_master.c b/engine/client/net_master.c
index 106bf1bd..917020aa 100644
--- a/engine/client/net_master.c
+++ b/engine/client/net_master.c
@@ -576,7 +576,6 @@ void Master_AddMasterHTTP (char *address, int mastertype, char *description)
 //build a linked list of masters.	Doesn't duplicate addresses.
 qboolean Master_LoadMasterList (char *filename, int defaulttype, int depth)
 {
-	extern char	*com_basedir;
 	vfsfile_t *f;
 	char line[1024];
 	char file[1024];
diff --git a/engine/client/pr_menu.c b/engine/client/pr_menu.c
index dd13a15a..334ccc9b 100644
--- a/engine/client/pr_menu.c
+++ b/engine/client/pr_menu.c
@@ -514,10 +514,8 @@ void PF_CL_drawresetcliparea (progfuncs_t *prinst, struct globalvars_s *pr_globa
 //void (float width, vector rgb, float alpha, float flags, vector pos1, ...) drawline;
 void PF_CL_drawline (progfuncs_t *prinst, struct globalvars_s *pr_globals)
 {
-	float width = G_FLOAT(OFS_PARM0);
 	float *rgb = G_VECTOR(OFS_PARM1);
 	float alpha = G_FLOAT(OFS_PARM2);
-	float flags = G_FLOAT(OFS_PARM3);
 	float *pos = G_VECTOR(OFS_PARM4);
 	int numpoints = *prinst->callargc-4;
 
diff --git a/engine/client/renderer.c b/engine/client/renderer.c
index cbd8ca23..8991f9b3 100644
--- a/engine/client/renderer.c
+++ b/engine/client/renderer.c
@@ -1461,9 +1461,6 @@ void D3DSucks(void)
 
 qboolean R_ApplyRenderer (rendererstate_t *newr)
 {
-	extern model_t *loadmodel;
-	extern int host_hunklevel;
-
 	if (newr->bpp == -1)
 		return false;
 
diff --git a/engine/client/sbar.c b/engine/client/sbar.c
index c596b59e..fbacdcf1 100644
--- a/engine/client/sbar.c
+++ b/engine/client/sbar.c
@@ -1715,8 +1715,6 @@ qboolean Sbar_ShouldDraw (void)
 #endif
 	qboolean headsup;
 
-	int deadcount=0;
-
 	if (scr_con_current == vid.height)
 		return false;		// console is full screen
 
@@ -1777,9 +1775,6 @@ Sbar_Draw
 */
 void Sbar_Draw (void)
 {
-#ifdef TEXTEDITOR
-	extern qboolean editoractive;
-#endif
 	qboolean headsup;
 	char st[512];
 	int pnum;
diff --git a/engine/client/snd_linux.c b/engine/client/snd_linux.c
index d03fd061..a1f448cf 100644
--- a/engine/client/snd_linux.c
+++ b/engine/client/snd_linux.c
@@ -63,7 +63,6 @@ static int OSS_InitCard(soundcardinfo_t *sc, int cardnum)
 	int fmt;
 	int tmp;
 	int i;
-	char *s;
 	struct audio_buf_info info;
 	int caps;
 	char *snddev = NULL;
diff --git a/engine/client/valid.c b/engine/client/valid.c
index a41e19ee..328eff39 100644
--- a/engine/client/valid.c
+++ b/engine/client/valid.c
@@ -323,12 +323,12 @@ void Validation_CheckIfResponse(char *text)
 
 	//now do the validation
 	{
-		f_query_t *query = NULL;
+		//f_query_t *query = NULL;
 		int itemp;
 		char buffer[10];
 		unsigned short query_crc = 0;
 		unsigned long	user_crc = 0;
-		unsigned long	auth_crc = 0;
+		//unsigned long	auth_crc = 0;
 		//char auth_answer; //unreferenced
 
 		//int slot; //unreferenced
diff --git a/engine/client/view.c b/engine/client/view.c
index e2c49aca..a2f01003 100644
--- a/engine/client/view.c
+++ b/engine/client/view.c
@@ -1244,7 +1244,9 @@ entity_t *CL_EntityNum(int num)
 float CalcFov (float fov_x, float width, float height);
 void SCR_VRectForPlayer(vrect_t *vrect, int pnum)
 {
+#ifdef GLQUAKE
 	extern int glwidth, glheight;
+#endif
 #if MAX_SPLITS > 4
 #pragma warning "Please change this function to cope with the new MAX_SPLITS value"
 #endif
diff --git a/engine/common/crc.c b/engine/common/crc.c
index ea220011..57d84129 100644
--- a/engine/common/crc.c
+++ b/engine/common/crc.c
@@ -95,4 +95,4 @@ void QCRC_AddBlock (unsigned short *crcvalue, qbyte *start, int count)
 {
     while (count--)
 		QCRC_ProcessByte(crcvalue, *start++);
-}
\ No newline at end of file
+}
diff --git a/engine/qclib/qccmain.c b/engine/qclib/qccmain.c
index c22d92b9..5017356c 100644
--- a/engine/qclib/qccmain.c
+++ b/engine/qclib/qccmain.c
@@ -2605,7 +2605,6 @@ void QCC_main (int argc, char **argv)	//as part of the quake engine
 	int		p;
 
 #ifndef QCCONLY
-	extern char    qcc_gamedir[];
 	char	destfile2[1024], *s2;
 #endif
 	char *s;
diff --git a/engine/server/sv_mvd.c b/engine/server/sv_mvd.c
index c49dddb8..37d5d0ab 100644
--- a/engine/server/sv_mvd.c
+++ b/engine/server/sv_mvd.c
@@ -217,7 +217,7 @@ void SV_MVD_RunPendingConnections(void)
 				}
 				if (end)
 				{	//we found the end of the header
-					qboolean server = false, reverse = false;
+					qboolean server = false;
 					char *start, *lineend;
 					int versiontouse = 0;
 					int raw = 0;