diff --git a/.gitignore b/.gitignore
index f73309646..133a5f626 100644
--- a/.gitignore
+++ b/.gitignore
@@ -106,3 +106,9 @@ htmlcov
 
 #Dynamic Library
 *.dylib
+
+#Visual Studio CMake Project
+/.vs/
+CMakeSettings.json
+/out/
+/openmc/lib/*.lib
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ee56c84ca..2a7b76560 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -325,8 +325,11 @@ else()
   add_library(libopenmc SHARED ${libopenmc_SOURCES})
 endif()
 
+# Avoid vs error lnk1149 :output filename matches input filename
+if(NOT MSVC)
 set_target_properties(libopenmc PROPERTIES
-  OUTPUT_NAME openmc)
+  OUTPUT_NAME openmc) 
+endif()
 
 target_include_directories(libopenmc
   PUBLIC
diff --git a/src/source.cpp b/src/source.cpp
index 21b12ed0d..3f31541db 100644
--- a/src/source.cpp
+++ b/src/source.cpp
@@ -386,7 +386,12 @@ void load_custom_source_library()
 
 void close_custom_source_library()
 {
+#ifdef HAS_DYNAMIC_LINKING
   dlclose(custom_source_library);
+#else
+  fatal_error("Custom source libraries have not yet been implemented for "
+              "non-POSIX systems");
+#endif
 }
 
 Particle::Bank sample_custom_source_library(uint64_t* seed)