diff --git a/aegisub/gl/Makefile.am b/aegisub/gl/Makefile.am
new file mode 100644
index 000000000..aa37d09a2
--- /dev/null
+++ b/aegisub/gl/Makefile.am
@@ -0,0 +1 @@
+EXTRA_aegisub_SOURCES = glext.h
diff --git a/aegisub/macosx/Makefile.am b/aegisub/macosx/Makefile.am
new file mode 100644
index 000000000..c6a017bf3
--- /dev/null
+++ b/aegisub/macosx/Makefile.am
@@ -0,0 +1,2 @@
+## TODO: this file probably needs to catch more of the files
+EXTRA_aegisub_SOURCES = bevelButton.cpp res.cpp
diff --git a/aegisub/win32/Makefile.am b/aegisub/win32/Makefile.am
new file mode 100644
index 000000000..cd4a2583a
--- /dev/null
+++ b/aegisub/win32/Makefile.am
@@ -0,0 +1,2 @@
+## Make sure stdint.h for MSVC is also included in source dists made by 'make dist'
+EXTRA_aegisub_SOURCES = stdint.h