diff --git a/d3xp/AF.cpp b/d3xp/AF.cpp
index e527b14..1a97edc 100644
--- a/d3xp/AF.cpp
+++ b/d3xp/AF.cpp
@@ -892,6 +892,11 @@ bool idAF::Load( idEntity *ent, const char *fileName ) {
 	for ( i = 0; i < physicsObj.GetNumConstraints(); i++ ) {
 		idAFConstraint *constraint = physicsObj.GetConstraint( i );
 		for ( j = 0; j < file->constraints.Num(); j++ ) {
+			// DG: FIXME: GCC rightfully complains that file->constraints[j]->type and constraint->GetType()
+			//  are of different enum types, and their values are different in some cases:
+			//  CONSTRAINT_HINGESTEERING has no DECLAF_CONSTRAINT_ equivalent,
+			//  and thus DECLAF_CONSTRAINT_SLIDER != CONSTRAINT_SLIDER (5 != 6)
+			//  and DECLAF_CONSTRAINT_SPRING != CONSTRAINT_SPRING (6 != 10)
 			if ( file->constraints[j]->name.Icmp( constraint->GetName() ) == 0 &&
 					file->constraints[j]->type == constraint->GetType() ) {
 				break;
diff --git a/d3xp/Pvs.cpp b/d3xp/Pvs.cpp
index 46e16f1..4894eb1 100644
--- a/d3xp/Pvs.cpp
+++ b/d3xp/Pvs.cpp
@@ -872,7 +872,8 @@ void idPVS::Shutdown( void ) {
 		delete[] areaPVS;
 		areaPVS = NULL;
 	}
-	if ( currentPVS ) {
+	// if ( currentPVS ) - DG: can't be NULL
+	{
 		for ( int i = 0; i < MAX_CURRENT_PVS; i++ ) {
 			delete[] currentPVS[i].pvs;
 			currentPVS[i].pvs = NULL;
diff --git a/d3xp/anim/Anim_Blend.cpp b/d3xp/anim/Anim_Blend.cpp
index da1249a..7df2552 100644
--- a/d3xp/anim/Anim_Blend.cpp
+++ b/d3xp/anim/Anim_Blend.cpp
@@ -172,7 +172,7 @@ index 0 will never be NULL.  Any anim >= NumAnims will return NULL.
 =====================
 */
 const idMD5Anim *idAnim::MD5Anim( int num ) const {
-	if ( anims == NULL || anims[0] == NULL ) {
+	if ( anims[0] == NULL ) {
 		return NULL;
 	}
 	return anims[ num ];
@@ -3057,6 +3057,7 @@ idDeclModelDef::NumJointsOnChannel
 int idDeclModelDef::NumJointsOnChannel( int channel ) const {
 	if ( ( channel < 0 ) || ( channel >= ANIM_NumAnimChannels ) ) {
 		gameLocal.Error( "idDeclModelDef::NumJointsOnChannel : channel out of range" );
+		return 0; // unreachable, (Error() doesn't return) just to shut up compiler
 	}
 	return channelJoints[ channel ].Num();
 }
@@ -3069,6 +3070,7 @@ idDeclModelDef::GetChannelJoints
 const int * idDeclModelDef::GetChannelJoints( int channel ) const {
 	if ( ( channel < 0 ) || ( channel >= ANIM_NumAnimChannels ) ) {
 		gameLocal.Error( "idDeclModelDef::GetChannelJoints : channel out of range" );
+		return NULL; // unreachable, (Error() doesn't return) just to shut up compiler
 	}
 	return channelJoints[ channel ].Ptr();
 }
diff --git a/game/AF.cpp b/game/AF.cpp
index e527b14..1a97edc 100644
--- a/game/AF.cpp
+++ b/game/AF.cpp
@@ -892,6 +892,11 @@ bool idAF::Load( idEntity *ent, const char *fileName ) {
 	for ( i = 0; i < physicsObj.GetNumConstraints(); i++ ) {
 		idAFConstraint *constraint = physicsObj.GetConstraint( i );
 		for ( j = 0; j < file->constraints.Num(); j++ ) {
+			// DG: FIXME: GCC rightfully complains that file->constraints[j]->type and constraint->GetType()
+			//  are of different enum types, and their values are different in some cases:
+			//  CONSTRAINT_HINGESTEERING has no DECLAF_CONSTRAINT_ equivalent,
+			//  and thus DECLAF_CONSTRAINT_SLIDER != CONSTRAINT_SLIDER (5 != 6)
+			//  and DECLAF_CONSTRAINT_SPRING != CONSTRAINT_SPRING (6 != 10)
 			if ( file->constraints[j]->name.Icmp( constraint->GetName() ) == 0 &&
 					file->constraints[j]->type == constraint->GetType() ) {
 				break;
diff --git a/game/Pvs.cpp b/game/Pvs.cpp
index 16e845a..4536710 100644
--- a/game/Pvs.cpp
+++ b/game/Pvs.cpp
@@ -872,7 +872,8 @@ void idPVS::Shutdown( void ) {
 		delete[] areaPVS;
 		areaPVS = NULL;
 	}
-	if ( currentPVS ) {
+	// if ( currentPVS ) - DG: can't be NULL
+	{
 		for ( int i = 0; i < MAX_CURRENT_PVS; i++ ) {
 			delete[] currentPVS[i].pvs;
 			currentPVS[i].pvs = NULL;
diff --git a/game/anim/Anim_Blend.cpp b/game/anim/Anim_Blend.cpp
index 0cbd4af..3f25a3d 100644
--- a/game/anim/Anim_Blend.cpp
+++ b/game/anim/Anim_Blend.cpp
@@ -172,7 +172,7 @@ index 0 will never be NULL.  Any anim >= NumAnims will return NULL.
 =====================
 */
 const idMD5Anim *idAnim::MD5Anim( int num ) const {
-	if ( anims == NULL || anims[0] == NULL ) {
+	if ( anims[0] == NULL ) {
 		return NULL;
 	}
 	return anims[ num ];
@@ -2971,6 +2971,7 @@ idDeclModelDef::NumJointsOnChannel
 int idDeclModelDef::NumJointsOnChannel( int channel ) const {
 	if ( ( channel < 0 ) || ( channel >= ANIM_NumAnimChannels ) ) {
 		gameLocal.Error( "idDeclModelDef::NumJointsOnChannel : channel out of range" );
+		return 0; // unreachable, (Error() doesn't return) just to shut up compiler
 	}
 	return channelJoints[ channel ].Num();
 }
@@ -2983,6 +2984,7 @@ idDeclModelDef::GetChannelJoints
 const int * idDeclModelDef::GetChannelJoints( int channel ) const {
 	if ( ( channel < 0 ) || ( channel >= ANIM_NumAnimChannels ) ) {
 		gameLocal.Error( "idDeclModelDef::GetChannelJoints : channel out of range" );
+		return NULL; // unreachable, (Error() doesn't return) just to shut up compiler
 	}
 	return channelJoints[ channel ].Ptr();
 }