diff --git a/src/hardware/r_opengl/r_opengl.h b/src/hardware/r_opengl/r_opengl.h
index 7ffefbb58..d52104370 100644
--- a/src/hardware/r_opengl/r_opengl.h
+++ b/src/hardware/r_opengl/r_opengl.h
@@ -86,7 +86,7 @@ boolean SetupGLfunc(void);
 boolean SetupGLFunc13(void);
 void Flush(void);
 INT32 isExtAvailable(const char *extension, const GLubyte *start);
-boolean SetupPixelFormat(INT32 WantColorBits, INT32 WantStencilBits, INT32 WantDepthBits);
+int SetupPixelFormat(INT32 WantColorBits, INT32 WantStencilBits, INT32 WantDepthBits);
 void SetModelView(GLint w, GLint h);
 void SetStates(void);
 FUNCMATH float byteasfloat(UINT8 fbyte);
diff --git a/src/hardware/s_openal/s_openal-vc10.vcxproj b/src/hardware/s_openal/s_openal-vc10.vcxproj
index 051de1bd6..1b7d34c4b 100644
--- a/src/hardware/s_openal/s_openal-vc10.vcxproj
+++ b/src/hardware/s_openal/s_openal-vc10.vcxproj
@@ -186,7 +186,7 @@
       </HeaderFileName>
     </Midl>
     <ClCompile>
-      <AdditionalOptions>/MP %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions>/MP /SAFESEH:OFF %(AdditionalOptions)</AdditionalOptions>
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;__WIN32__;__MSC__;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <MinimalRebuild>true</MinimalRebuild>
@@ -244,6 +244,7 @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <AdditionalOptions>/MP /SAFESEH:OFF %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
diff --git a/src/sdl/Srb2SDL-vc10.vcxproj b/src/sdl/Srb2SDL-vc10.vcxproj
index 07c10f4cf..58dba7f28 100644
--- a/src/sdl/Srb2SDL-vc10.vcxproj
+++ b/src/sdl/Srb2SDL-vc10.vcxproj
@@ -133,6 +133,7 @@
       <DataExecutionPrevention>
       </DataExecutionPrevention>
       <TargetMachine>MachineX86</TargetMachine>
+      <AdditionalOptions>/SAFESEH:NO %(AdditionalOptions)</AdditionalOptions>
     </Link>
     <Bscmake>
       <SuppressStartupBanner>true</SuppressStartupBanner>
@@ -182,6 +183,7 @@
       <DataExecutionPrevention>
       </DataExecutionPrevention>
       <TargetMachine>MachineX64</TargetMachine>
+      <AdditionalOptions>/SAFESEH:NO %(AdditionalOptions)</AdditionalOptions>
     </Link>
     <Bscmake>
       <SuppressStartupBanner>true</SuppressStartupBanner>
diff --git a/src/win32/Srb2win-vc10.vcxproj b/src/win32/Srb2win-vc10.vcxproj
index a7c938ae9..6d05735e5 100644
--- a/src/win32/Srb2win-vc10.vcxproj
+++ b/src/win32/Srb2win-vc10.vcxproj
@@ -117,11 +117,12 @@
       <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
       <ProgramDataBaseFileName>$(IntDir)Srb2win.pdb</ProgramDataBaseFileName>
       <BrowseInformation>true</BrowseInformation>
-      <WarningLevel>Level4</WarningLevel>
+      <WarningLevel>Level2</WarningLevel>
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <DebugInformationFormat>EditAndContinue</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>false</MultiProcessorCompilation>
+      <TreatWarningAsError>true</TreatWarningAsError>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -173,11 +174,12 @@
       <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
       <ProgramDataBaseFileName>$(IntDir)Srb2win.pdb</ProgramDataBaseFileName>
       <BrowseInformation>true</BrowseInformation>
-      <WarningLevel>Level4</WarningLevel>
+      <WarningLevel>Level2</WarningLevel>
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>false</MultiProcessorCompilation>
+      <TreatWarningAsError>true</TreatWarningAsError>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -228,11 +230,12 @@
       <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
       <ProgramDataBaseFileName>$(IntDir)Srb2win.pdb</ProgramDataBaseFileName>
       <BrowseInformation>true</BrowseInformation>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level2</WarningLevel>
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <TreatWarningAsError>true</TreatWarningAsError>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -283,11 +286,12 @@
       <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
       <ProgramDataBaseFileName>$(IntDir)Srb2win.pdb</ProgramDataBaseFileName>
       <BrowseInformation>true</BrowseInformation>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level2</WarningLevel>
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <TreatWarningAsError>true</TreatWarningAsError>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
diff --git a/src/win32/win_main.h b/src/win32/win_main.h
index 2c464f2c6..05852f834 100644
--- a/src/win32/win_main.h
+++ b/src/win32/win_main.h
@@ -23,7 +23,7 @@
 
 extern HWND hWndMain;
 
-extern int appActive;
+extern boolean appActive;
 
 VOID I_GetSysMouseEvents(INT mouse_state);
 extern UINT MSHWheelMessage;