Index: ext/libicpf/src/libicpf/crc32.cpp
===================================================================
diff -u -N -re31dc31ccf2010abee81ddc399d65b57e4803278 -r4c06fdbee6be461a9997de3d5b7a8f63e5944757
--- ext/libicpf/src/libicpf/crc32.cpp	(.../crc32.cpp)	(revision e31dc31ccf2010abee81ddc399d65b57e4803278)
+++ ext/libicpf/src/libicpf/crc32.cpp	(.../crc32.cpp)	(revision 4c06fdbee6be461a9997de3d5b7a8f63e5944757)
@@ -157,7 +157,7 @@
 /** Finished calculating a checksum.
  * \param[in/out] puiValue - ptr to the variable with a crc32 value calculated so far
  */
-void crc32_finish(const uint_t* puiValue)
+void crc32_finish(const uint_t* /*puiValue*/)
 {
 	assert(puiValue);
 	return;
Index: ext/libicpf/src/libicpf/libicpf.vc90.vcproj
===================================================================
diff -u -N -r68147af121d76b78d924a8b62d9793578c81b9e4 -r4c06fdbee6be461a9997de3d5b7a8f63e5944757
--- ext/libicpf/src/libicpf/libicpf.vc90.vcproj	(.../libicpf.vc90.vcproj)	(revision 68147af121d76b78d924a8b62d9793578c81b9e4)
+++ ext/libicpf/src/libicpf/libicpf.vc90.vcproj	(.../libicpf.vc90.vcproj)	(revision 4c06fdbee6be461a9997de3d5b7a8f63e5944757)
@@ -54,6 +54,7 @@
 				UsePrecompiledHeader="0"
 				ProgramDataBaseFileName="$(IntDir)\$(TargetName)_vs90.pdb"
 				WarningLevel="4"
+				WarnAsError="true"
 				DebugInformationFormat="4"
 			/>
 			<Tool
@@ -136,6 +137,7 @@
 				UsePrecompiledHeader="0"
 				ProgramDataBaseFileName="$(IntDir)\$(TargetName)_vs90.pdb"
 				WarningLevel="4"
+				WarnAsError="true"
 				DebugInformationFormat="3"
 			/>
 			<Tool
@@ -211,6 +213,7 @@
 				UsePrecompiledHeader="0"
 				ProgramDataBaseFileName="$(IntDir)\$(TargetName)_vs90.pdb"
 				WarningLevel="4"
+				WarnAsError="true"
 				DebugInformationFormat="3"
 			/>
 			<Tool
@@ -291,6 +294,7 @@
 				UsePrecompiledHeader="0"
 				ProgramDataBaseFileName="$(IntDir)\$(TargetName)_vs90.pdb"
 				WarningLevel="4"
+				WarnAsError="true"
 				DebugInformationFormat="3"
 			/>
 			<Tool