diff --git a/engines/hpl1/engine/game/low_level_game_setup.cpp b/engines/hpl1/engine/game/low_level_game_setup.cpp
index 0c0c8a77abd..1e8a92c177e 100644
--- a/engines/hpl1/engine/game/low_level_game_setup.cpp
+++ b/engines/hpl1/engine/game/low_level_game_setup.cpp
@@ -28,6 +28,7 @@
 #include "hpl1/engine/resources/low_level_resources.h"
 #include "hpl1/engine/impl/LowLevelSoundOpenAL.h"
 #include "hpl1/engine/impl/MouseSDL.h"
+#include "hpl1/engine/haptic/LowLevelHaptic.h"
 
 namespace hpl {
 
diff --git a/engines/hpl1/engine/gui/GuiSet.cpp b/engines/hpl1/engine/gui/GuiSet.cpp
index 6904c0fba3d..5989af5d6ac 100644
--- a/engines/hpl1/engine/gui/GuiSet.cpp
+++ b/engines/hpl1/engine/gui/GuiSet.cpp
@@ -377,7 +377,7 @@ void cGuiSet::DrawFont(const tWString &asText,
 					   const cVector2f &avSize, const cColor &aColor,
 					   eFontAlign aAlign, eGuiMaterial aMaterial) {
 	int lCount = 0;
-	float lXAdd = 0;
+	//float lXAdd = 0;
 	cVector3f vPos = avPos;
 
 	if (aAlign == eFontAlign_Center) {
@@ -586,7 +586,7 @@ void cGuiSet::DestroyWidget(iWidget *apWidget) {
 void cGuiSet::CreatePopUpMessageBox(const tWString &asLabel, const tWString &asText,
 									const tWString &asButton1, const tWString &asButton2,
 									void *apCallbackObject, tGuiCallbackFunc apCallback) {
-	cGuiPopUpMessageBox *pMessageBox = hplNew(cGuiPopUpMessageBox, (this, asLabel, asText,
+	/* cGuiPopUpMessageBox *pMessageBox = */(void)hplNew(cGuiPopUpMessageBox, (this, asLabel, asText,
 																	asButton1, asButton2,
 																	apCallbackObject, apCallback));
 }
@@ -835,7 +835,7 @@ void cGuiSet::RenderClipRegion() {
 		// Iterate for all with same texture and material
 		do {
 			cGuiRenderObject object = *it;
-			cGuiGfxElement *pGfx = object.mpGfx;
+			pGfx = object.mpGfx;
 
 			if (kLogRender) {
 				if (pGfx->mvImages[0])
diff --git a/engines/hpl1/engine/impl/CollideShapeNewton.cpp b/engines/hpl1/engine/impl/CollideShapeNewton.cpp
index c0e12d9f9a4..20f844dabe1 100644
--- a/engines/hpl1/engine/impl/CollideShapeNewton.cpp
+++ b/engines/hpl1/engine/impl/CollideShapeNewton.cpp
@@ -62,8 +62,7 @@ cCollideShapeNewton::cCollideShapeNewton(eCollideShapeType aType, const cVector3
 		////////////////////////////////////////////
 		// Create Newton collision
 
-  		switch(aType)
-		{
+  		switch(aType) {
 		case eCollideShapeType_Null:		mpNewtonCollision = NewtonCreateNull(apNewtonWorld); break;
 
 		case eCollideShapeType_Box:			mpNewtonCollision = NewtonCreateBox(apNewtonWorld,
@@ -81,6 +80,8 @@ cCollideShapeNewton::cCollideShapeNewton(eCollideShapeType aType, const cVector3
 		case eCollideShapeType_Capsule:		mpNewtonCollision = NewtonCreateCapsule(apNewtonWorld,
 												mvSize.x, mvSize.y,
 												0, pMtx); break;
+		default:
+			break;
 		}
 
 	////////////////////////////////////////////
diff --git a/engines/hpl1/engine/impl/LowLevelGraphicsSDL.cpp b/engines/hpl1/engine/impl/LowLevelGraphicsSDL.cpp
index 4374eba172b..2cbd4dbe62e 100644
--- a/engines/hpl1/engine/impl/LowLevelGraphicsSDL.cpp
+++ b/engines/hpl1/engine/impl/LowLevelGraphicsSDL.cpp
@@ -63,6 +63,7 @@ GLenum ColorFormatToGL(eColorDataFormat format) {
 		break;
 	}
 	Hpl1::logError(Hpl1::kDebugOpenGL, "invalid color format (%d)", format);
+	return GL_RGB;
 }
 
 GLenum TextureTargetToGL(eTextureTarget target) {
@@ -81,6 +82,7 @@ GLenum TextureTargetToGL(eTextureTarget target) {
 		break;
 	}
 	Hpl1::logError(Hpl1::kDebugOpenGL, "invalid texture target (%d)", target);
+	return GL_TEXTURE_1D;
 }
 
 cLowLevelGraphicsSDL::cLowLevelGraphicsSDL() {
@@ -863,7 +865,7 @@ void cLowLevelGraphicsSDL::SetStencilTwoSide(eStencilFunc aFrontFunc, eStencilFu
 
 void cLowLevelGraphicsSDL::SetStencilTwoSide(bool abX) {
 	if (GetCaps(eGraphicCaps_TwoSideStencil))
-		Hpl1::logError(Hpl1::kDebugOpenGL, "call to setStencilTwoSide with two side stencil enabled");
+		Hpl1::logError(Hpl1::kDebugOpenGL, "call to setStencilTwoSide with two side stencil enabled%c", ".");
 }
 
 //-----------------------------------------------------------------------
diff --git a/engines/hpl1/engine/impl/LowLevelGraphicsSDL.h b/engines/hpl1/engine/impl/LowLevelGraphicsSDL.h
index 0252fb11628..3fffbd82b9e 100644
--- a/engines/hpl1/engine/impl/LowLevelGraphicsSDL.h
+++ b/engines/hpl1/engine/impl/LowLevelGraphicsSDL.h
@@ -245,7 +245,7 @@ private:
 	int mlBpp;
 
 	// Gamma
-	uint16 mvStartGammaArray[3][256];
+	//uint16 mvStartGammaArray[3][256];
 	float mfGammaCorrection;
 
 	// Clipping
diff --git a/engines/hpl1/engine/impl/MeshLoaderCollada.cpp b/engines/hpl1/engine/impl/MeshLoaderCollada.cpp
index 88f58034154..fedce9dcca2 100644
--- a/engines/hpl1/engine/impl/MeshLoaderCollada.cpp
+++ b/engines/hpl1/engine/impl/MeshLoaderCollada.cpp
@@ -1711,8 +1711,8 @@ void cMeshLoaderCollada::AddSceneObjects(cColladaNode *apNode, cWorld3D *apWorld
 
 				// If no entity was loaded, try old style.
 				if (pEntity == NULL) {
-					tString sName = vParams[1];
-					tString sFile = cString::Sub(apNode->msName, 5 + (int)+sName.size() + 1);
+					sName = vParams[1];
+					sFile = cString::Sub(apNode->msName, 5 + (int)+sName.size() + 1);
 					sFile = cString::SetFileExt(sFile, "ent");
 
 					apWorld->CreateEntity(sName, apNode->m_mtxWorldTransform, sFile, true);
@@ -1827,7 +1827,7 @@ void cMeshLoaderCollada::AddSceneObjects(cColladaNode *apNode, cWorld3D *apWorld
 				Error("Too few params in billboard entity entity '%s'\n", apNode->msName.c_str());
 			} else {
 				tString sName = vParams[vParams.size() - 1];
-				tString sType = "";
+				sType = "";
 				for (size_t i = 1; i < vParams.size() - 1; ++i) {
 					sType += vParams[i];
 					if (i != vParams.size() - 2)
@@ -1840,7 +1840,7 @@ void cMeshLoaderCollada::AddSceneObjects(cColladaNode *apNode, cWorld3D *apWorld
 				if (pPS == NULL) {
 					sName = vParams[1];
 					sType = cString::Sub(apNode->msName, 4 + (int)sName.size() + 1);
-					cParticleSystem3D *pPS = apWorld->CreateParticleSystem(sName, sType, apNode->mvScale,
+					pPS = apWorld->CreateParticleSystem(sName, sType, apNode->mvScale,
 																		   apNode->m_mtxWorldTransform);
 
 					if (pPS == NULL) {
@@ -1872,7 +1872,6 @@ void cMeshLoaderCollada::AddSceneObjects(cColladaNode *apNode, cWorld3D *apWorld
 				TempBV.AddArrayPoints(&vVertexVec[0], (int)vArray.size());
 				TempBV.CreateFromPoints(3);
 
-				tString sType;
 				tString sName;
 				if (vParams.size() < 3 || (mFlags & eWorldLoadFlag_NoGameEntities)) {
 					sType = "";