diff --git a/2dlib/CMakeLists.txt b/2dlib/CMakeLists.txt
index 038ebe05..5821a3b9 100644
--- a/2dlib/CMakeLists.txt
+++ b/2dlib/CMakeLists.txt
@@ -12,4 +12,5 @@ set(CPPS
 add_library(2dlib STATIC ${HEADERS} ${CPPS})
 target_link_libraries(2dlib PRIVATE
   cfile
+  mem
 )
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 79a5a31c..b05a66e9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -149,8 +149,6 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
   add_compile_options("/MP")  # so msbuild builds with multiple processes
 endif()
 
-add_compile_definitions($<$<BOOL:${ENABLE_MEM_RTL}>:MEM_USE_RTL>)
-
 add_compile_definitions($<$<CONFIG:Release>:RELEASE>)
 add_compile_definitions($<$<CONFIG:Debug>:_DEBUG>)
 
diff --git a/bitmap/CMakeLists.txt b/bitmap/CMakeLists.txt
index c3c59202..b646b636 100644
--- a/bitmap/CMakeLists.txt
+++ b/bitmap/CMakeLists.txt
@@ -15,6 +15,7 @@ target_link_libraries(bitmap PRIVATE
   cfile
   ddebug
   ddio
+  mem
   stb
 )
 target_include_directories(bitmap PUBLIC
diff --git a/cfile/CMakeLists.txt b/cfile/CMakeLists.txt
index 61959fa3..eea245a6 100644
--- a/cfile/CMakeLists.txt
+++ b/cfile/CMakeLists.txt
@@ -7,6 +7,7 @@ set(CPPS
 add_library(cfile STATIC ${CPPS})
 target_link_libraries(cfile PRIVATE
   ddio
+  mem
 )
 target_include_directories(cfile PUBLIC
   $<BUILD_INTERFACE:
diff --git a/ddebug/CMakeLists.txt b/ddebug/CMakeLists.txt
index 44bde46a..1d14a59c 100644
--- a/ddebug/CMakeLists.txt
+++ b/ddebug/CMakeLists.txt
@@ -18,3 +18,6 @@ target_include_directories(ddebug PUBLIC
   >
   PRIVATE ${PROJECT_BINARY_DIR}/lib   # For d3_version.h
 )
+target_link_libraries(ddebug PRIVATE
+  mem
+)
diff --git a/ddio/CMakeLists.txt b/ddio/CMakeLists.txt
index 857106f5..03b8ac0f 100644
--- a/ddio/CMakeLists.txt
+++ b/ddio/CMakeLists.txt
@@ -24,8 +24,9 @@ set(CPPS
   >
 )
 add_library(ddio STATIC ${CPPS})
-target_link_libraries(ddio
+target_link_libraries(ddio PRIVATE
   ddebug
+  mem
 )
 target_include_directories(ddio PUBLIC
   $<BUILD_INTERFACE:
diff --git a/grtext/CMakeLists.txt b/grtext/CMakeLists.txt
index 6f55b4e2..a9a3068c 100644
--- a/grtext/CMakeLists.txt
+++ b/grtext/CMakeLists.txt
@@ -7,4 +7,5 @@ set(CPPS
 add_library(grtext STATIC ${HEADERS} ${CPPS})
 target_link_libraries(grtext PRIVATE
   ddio
+  mem
 )
diff --git a/manage/CMakeLists.txt b/manage/CMakeLists.txt
index de9e6866..d4d3a268 100644
--- a/manage/CMakeLists.txt
+++ b/manage/CMakeLists.txt
@@ -25,6 +25,7 @@ add_library(manage STATIC ${HEADERS} ${CPPS})
 target_link_libraries(manage PRIVATE
   cfile
   ddio
+  mem
   sndlib
   stream_audio
 )
diff --git a/mem/CMakeLists.txt b/mem/CMakeLists.txt
index c3691404..c00895eb 100644
--- a/mem/CMakeLists.txt
+++ b/mem/CMakeLists.txt
@@ -1,5 +1,13 @@
-set(HEADERS)
 set(CPPS
-  mem.cpp)
+  mem.cpp
+)
 
-add_library(mem STATIC ${HEADERS} ${CPPS})
+add_library(mem STATIC ${CPPS})
+target_compile_definitions(mem PUBLIC
+  $<$<BOOL:${ENABLE_MEM_RTL}>:MEM_USE_RTL>
+)
+target_include_directories(mem PUBLIC
+  $<BUILD_INTERFACE:
+    ${PROJECT_SOURCE_DIR}/mem
+  >
+)
diff --git a/lib/mem.h b/mem/mem.h
similarity index 100%
rename from lib/mem.h
rename to mem/mem.h
diff --git a/model/CMakeLists.txt b/model/CMakeLists.txt
index 6496b505..b3e73277 100644
--- a/model/CMakeLists.txt
+++ b/model/CMakeLists.txt
@@ -6,4 +6,5 @@ set(CPPS
 add_library(model STATIC ${HEADERS} ${CPPS})
 target_link_libraries(model PRIVATE
   ddio
+  mem
 )
diff --git a/movie/CMakeLists.txt b/movie/CMakeLists.txt
index 0fae401c..334a2071 100644
--- a/movie/CMakeLists.txt
+++ b/movie/CMakeLists.txt
@@ -6,4 +6,5 @@ add_library(movie STATIC ${HEADERS} ${CPPS})
 target_link_libraries(movie PRIVATE
   ddio
   libmve
+  mem
 )
diff --git a/music/CMakeLists.txt b/music/CMakeLists.txt
index 7799f629..875a4a54 100644
--- a/music/CMakeLists.txt
+++ b/music/CMakeLists.txt
@@ -9,6 +9,7 @@ add_library(music STATIC ${HEADERS} ${CPPS})
 target_link_libraries(music
   cfile
   ddio
+  mem
   sndlib
   stream_audio
 )
diff --git a/netcon/inetfile/CMakeLists.txt b/netcon/inetfile/CMakeLists.txt
index 2e2edb71..7e825200 100644
--- a/netcon/inetfile/CMakeLists.txt
+++ b/netcon/inetfile/CMakeLists.txt
@@ -6,3 +6,6 @@ set(CPPS
   inetgetfile.cpp)
 
 add_library(inetfile STATIC ${HEADERS} ${CPPS})
+target_link_libraries(inetfile PRIVATE
+  mem
+)
diff --git a/networking/CMakeLists.txt b/networking/CMakeLists.txt
index 50928477..89b8bc00 100644
--- a/networking/CMakeLists.txt
+++ b/networking/CMakeLists.txt
@@ -1,14 +1,13 @@
 set(HEADERS)
 set(CPPS
-  networking.cpp)
+  networking.cpp
+  $<$<PLATFORM_ID:Windows>:
+    directplay.cpp
+  >
+)
 
-set(PLATFORMCPPS)
-
-if(WIN32)
-  set(PLATFORMCPPS "directplay.cpp")
-endif()
-
-add_library(networking STATIC ${HEADERS} ${CPPS} ${PLATFORMCPPS})
+add_library(networking STATIC ${HEADERS} ${CPPS})
 target_link_libraries(networking PRIVATE
   ddio
+  mem
 )
diff --git a/physics/CMakeLists.txt b/physics/CMakeLists.txt
index 6a6fd011..0d16f9fe 100644
--- a/physics/CMakeLists.txt
+++ b/physics/CMakeLists.txt
@@ -8,5 +8,6 @@ set(CPPS
 add_library(physics STATIC ${HEADERS} ${CPPS})
 target_link_libraries(physics PRIVATE
   ddio
+  mem
   sndlib
 )
diff --git a/renderer/CMakeLists.txt b/renderer/CMakeLists.txt
index 636a0955..094d7cca 100644
--- a/renderer/CMakeLists.txt
+++ b/renderer/CMakeLists.txt
@@ -27,4 +27,5 @@ add_library(renderer STATIC ${HEADERS} ${CPPS})
 target_link_libraries(renderer PRIVATE
   bitmap
   ddio
+  mem
 )
diff --git a/sndlib/CMakeLists.txt b/sndlib/CMakeLists.txt
index b9d8dc44..d9f7d119 100644
--- a/sndlib/CMakeLists.txt
+++ b/sndlib/CMakeLists.txt
@@ -21,6 +21,7 @@ add_library(sndlib STATIC ${CPPS})
 target_link_libraries(sndlib PRIVATE
   cfile
   ddio
+  mem
   stream_audio
 )
 target_include_directories(sndlib PUBLIC
diff --git a/stream_audio/CMakeLists.txt b/stream_audio/CMakeLists.txt
index fc5dd3f1..b1d9abc3 100644
--- a/stream_audio/CMakeLists.txt
+++ b/stream_audio/CMakeLists.txt
@@ -7,6 +7,7 @@ add_library(stream_audio STATIC ${HEADERS} ${CPPS})
 target_link_libraries(stream_audio PRIVATE
   ddio
   libacm
+  mem
   sndlib
 )
 target_include_directories(stream_audio PUBLIC
diff --git a/ui/CMakeLists.txt b/ui/CMakeLists.txt
index 0350db8c..6d47e421 100644
--- a/ui/CMakeLists.txt
+++ b/ui/CMakeLists.txt
@@ -19,4 +19,5 @@ set(CPPS
 add_library(ui STATIC ${HEADERS} ${CPPS})
 target_link_libraries(ui PRIVATE
   ddio
+  mem
 )