diff --git a/librecomp/CMakeLists.txt b/librecomp/CMakeLists.txt
index 9c4bf53..3e460f0 100644
--- a/librecomp/CMakeLists.txt
+++ b/librecomp/CMakeLists.txt
@@ -4,6 +4,7 @@ project(librecomp)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED True)
 set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_C_STANDARD 11)
 
 # Define the library
 add_library(librecomp STATIC
@@ -46,11 +47,13 @@ target_include_directories(librecomp PRIVATE
     "${CMAKE_CURRENT_SOURCE_DIR}/include/librecomp"
 )
 
-target_compile_options(librecomp PRIVATE
-#    -Wall
-#    -Wextra
-    -Wno-unused-parameter
-)
+if (NOT CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+    target_compile_options(librecomp PRIVATE
+        # -Wall
+        # -Wextra
+        -Wno-unused-parameter
+    )
+endif()
 
 if (WIN32)
     add_compile_definitions(NOMINMAX)
diff --git a/librecomp/include/librecomp/rsp_vu_impl.hpp b/librecomp/include/librecomp/rsp_vu_impl.hpp
index dbf46b2..d3cdc2b 100644
--- a/librecomp/include/librecomp/rsp_vu_impl.hpp
+++ b/librecomp/include/librecomp/rsp_vu_impl.hpp
@@ -36,6 +36,12 @@ using u32 = uint32_t;
 #define DIVOUT vpu.divout
 #define DIVDP  vpu.divdp
 
+#ifdef _MSC_VER
+#define COUNT_LEADING_ZEROES __lzcnt
+#else
+#define COUNT_LEADING_ZEROES __builtin_clz
+#endif
+
 auto RSP::r128::operator()(u32 index) const -> r128 {
     if constexpr (Accuracy::RSP::SISD) {
         r128 v{ *this };
@@ -1348,7 +1354,7 @@ auto RSP::VRCP(r128& vd, u8 de, cr128& vt) -> void {
     } else if (input == -32768) {
         result = 0xffff'0000;
     } else {
-        u32 shift = __builtin_clz(data);
+        u32 shift = COUNT_LEADING_ZEROES(data);
         u32 index = (u64(data) << shift & 0x7fc0'0000) >> 22;
         result = rspReciprocals[index];
         result = (0x10000 | result) << 14;
@@ -1400,7 +1406,7 @@ auto RSP::VRSQ(r128& vd, u8 de, cr128& vt) -> void {
     } else if (input == -32768) {
         result = 0xffff'0000;
     } else {
-        u32 shift = __builtin_clz(data);
+        u32 shift = COUNT_LEADING_ZEROES(data);
         u32 index = (u64(data) << shift & 0x7fc0'0000) >> 22;
         result = rspInverseSquareRoots[index & 0x1fe | shift & 1];
         result = (0x10000 | result) << 14;
diff --git a/ultramodern/CMakeLists.txt b/ultramodern/CMakeLists.txt
index 90ac35a..a5c7656 100644
--- a/ultramodern/CMakeLists.txt
+++ b/ultramodern/CMakeLists.txt
@@ -29,11 +29,13 @@ target_include_directories(ultramodern PUBLIC
     "${PROJECT_SOURCE_DIR}/../thirdparty/sse2neon"
 )
 
-target_compile_options(ultramodern PRIVATE
-#    -Wall
-#    -Wextra
-    -Wno-unused-parameter
-)
+if (NOT CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+    target_compile_options(ultramodern PRIVATE
+        # -Wall
+        # -Wextra
+        -Wno-unused-parameter
+    )
+endif()
 
 if (WIN32)
     add_compile_definitions(NOMINMAX)