diff --git a/Makefile b/Makefile
index 76334b5..f37342d 100755
--- a/Makefile
+++ b/Makefile
@@ -1,15 +1,10 @@
-CFLAGS = $(WARNINGS) $(DEFINES) $(INCLUDES)
-WARNINGS = -W -Wall
-#DEFINES = -D_XOPEN_SOURCE=600
-INCLUDES = -I$(LUA)/include
-
-LUA = /home/mark/src/lang/lua/lua-5.1-rc1
-
-default:; echo Choose platform: mingw cygwin posix
+default:; @echo Choose a platform: mingw cygwin linux
 all: mingw cygwin
 
 mingw:; $(MAKE) -C w32api ex.dll
-cygwin:; $(MAKE) -C posix ex.dll
-posix:; $(MAKE) -C posix ex.so
+cygwin:; $(MAKE) -C posix T=ex.dll ex.dll
+linux:; $(MAKE) -C posix ex.so
 
-#"EX_LIB=ex.so" "DEFINES=-D_XOPEN_SOURCE=600"
+clean:
+	$(MAKE) -C posix clean
+	$(MAKE) -C w32api clean
diff --git a/README b/README
index 0d7661a..1190dfb 100755
--- a/README
+++ b/README
@@ -1,3 +1,7 @@
+"ex" API implementation
+http://lua-users.org/wiki/ExtensionProposal
+Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+
 -- Environment
 os.getenv(name) -- get environment variable
 os.setenv(name, value) -- set/unset environment variable
@@ -7,17 +11,18 @@ os.environ() -- returns a copy of the environment
 os.sleep(seconds) -- sleep for (floating) seconds
 
 -- File system
-os.chdir(pathname)
 cwd = os.currentdir()
+os.chdir(pathname)
 os.mkdir(pathname)
+os.remove(pathname)
 
-for stat in os.dir(pathname) do ; end
-stat = os.stat(pathname)
+for entry in os.dir(pathname) do ; end
+entry = os.dirent(pathname)
 --[[
-	stat is a table, containing at least the following keys:
-	name: the filename
-	type: "file" or "directory" or another implementation-defined string
-	size: the file size in bytes
+  entry is a table, containing at least the following keys:
+  name: the filename
+  type: "file" or "directory" or another implementation-defined string
+  size: the file size in bytes
 --]]
 
 -- Locking and pipes
diff --git a/conf b/conf
new file mode 100755
index 0000000..3b6b6b2
--- /dev/null
+++ b/conf
@@ -0,0 +1,17 @@
+### Change these to match your Lua installation
+LUA= /home/medgar/src/lang/lua/lua-5.1.1
+LUAINC= -I$(LUA)/src
+LUALIB= -L$(LUA)/src -llua51
+
+#LUA= /home/mark/luabinaries/lua51
+#LUAINC= -I$(LUA)/include
+#LUALIB= -L$(LUA) -llua5.1
+
+### Comment these if your system actually has posix_spawn()
+POSIX_SPAWN= -DMISSING_POSIX_SPAWN
+EXTRA= posix_spawn.o
+
+### Change this if your system properly declares environ.
+#ENVIRON= -DENVIRON_DECL=
+ENVIRON= -DENVIRON_DECL="extern char **environ;"
+
diff --git a/posix/Makefile b/posix/Makefile
index 1d5dfd9..b83c328 100755
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -1,25 +1,18 @@
-CFLAGS = $(WARNINGS) $(DEFINES) $(INCLUDES)
-DEFINES = $(DEBUG) -D_XOPEN_SOURCE=600 -DMISSING_POSIX_SPAWN -DENVIRON_DECL="extern char **environ;"
-DEBUG= -D'debug(...)=fprintf(stderr,__VA_ARGS__)'
-# -D_POSIX_SOURCE -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112L \
-	-U__STRICT_ANSI__ -D_GNU_SOURCE
-INCLUDES = -I$(LUA)/include -I$(LUA)/src
-WARNINGS = -W -Wall
-#LUA = /home/mark/src/lang/lua/lua-5.1-rc2
-LUA = /home/medgar/src/lang/lua/lua-5.1.1
-#LUA = /home/medgar/src/lang/lua/lua5_1_1/cygw15
-LIBS = -L$(LUA)/src -llua5.1
+include ../conf
 
-ex-OBJS = ex.o spawn.o
+CFLAGS= $(WARNINGS) $(DEFINES) $(INCLUDES)
+DEFINES= -D_XOPEN_SOURCE=600 $(POSIX_SPAWN) $(ENVIRON)
+INCLUDES= $(LUAINC)
+WARNINGS= -W -Wall
+LIBS= $(LUALIB)
 
-default: ex.so
-
-EXTRA = posix_spawn.o
-ex.so: $(ex-OBJS) $(EXTRA); $(CC) -shared -o $@ $(ex-OBJS) $(EXTRA) $(LIBS)
+T= ex.so
+default: $(T)
 
+OBJS= ex.o spawn.o $(EXTRA)
+$(T): $(OBJS) $(EXTRA); $(CC) -shared -o $@ $(OBJS) $(LIBS)
 ex.o: ex.c spawn.h
 spawn.o: spawn.c spawn.h
-
 posix_spawn.o: posix_spawn.c posix_spawn.h
 
-clean:; rm -f *.o ex.dll ex.so ex.a
+clean:; rm -f *.o ex.so ex.dll $(T)
diff --git a/posix/ex.c b/posix/ex.c
index 78b79ec..e602813 100755
--- a/posix/ex.c
+++ b/posix/ex.c
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
diff --git a/posix/posix_spawn.c b/posix/posix_spawn.c
index a1499b0..470a952 100755
--- a/posix/posix_spawn.c
+++ b/posix/posix_spawn.c
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #include <stdlib.h>
 #include <assert.h>
 #include <errno.h>
diff --git a/posix/posix_spawn.h b/posix/posix_spawn.h
index f4d576d..3e0bbd7 100755
--- a/posix/posix_spawn.h
+++ b/posix/posix_spawn.h
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #include <sched.h>
 #include <signal.h>
 #include <sys/types.h>
diff --git a/posix/spawn.c b/posix/spawn.c
index b39d53b..aaa5600 100755
--- a/posix/spawn.c
+++ b/posix/spawn.c
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #include <unistd.h>
 ENVIRON_DECL
 #include <sys/wait.h>
diff --git a/posix/spawn.h b/posix/spawn.h
index bb5df7c..3fddfb7 100755
--- a/posix/spawn.h
+++ b/posix/spawn.h
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #ifndef SPAWN_H
 #define SPAWN_H
 
diff --git a/w32api/Makefile b/w32api/Makefile
index a752624..0f32736 100755
--- a/w32api/Makefile
+++ b/w32api/Makefile
@@ -1,17 +1,13 @@
-TARGET_ARCH = -mno-cygwin
-CFLAGS = $(WARNINGS) $(DEFINES) $(INCLUDES)
-DEFINES = -DWIN32_LEAN_AND_MEAN
-INCLUDES = -I${LUA}/include
-WARNINGS = -W -Wall -Wno-missing-braces
-#LUA = /home/mark/src/lang/lua/lua-5.1-rc2
-#LUA = /home/mark/src/lang/lua/lua51
-LUA = /home/medgar/work/noom/lua/lua51
-LUALIBS = -L$(LUA) -llua5.1
+include ../conf
 
-ex.dll-OBJS = ex.o spawn.o pusherror.o dirent.o
-ex.dll-LIBS = $(LUALIBS) $(EXTRALIBS)
-ex.dll: $(ex.dll-OBJS)
-	$(CC) $(TARGET_ARCH) -shared -o $@ $(ex.dll-OBJS) $(ex.dll-LIBS)
-clean:; rm ex.dll *.o
+TARGET_ARCH= -mno-cygwin
+CFLAGS= $(WARNINGS) $(DEFINES) $(INCLUDES)
+DEFINES= -DWIN32_LEAN_AND_MEAN -DNOGDI
+INCLUDES= $(LUAINC)
+WARNINGS= -W -Wall -Wno-missing-braces
 
-wdir.o: wdir.c wdir.h
+OBJS= ex.o spawn.o pusherror.o dirent.o
+LIBS= $(LUALIB)
+ex.dll: $(OBJS); $(CC) $(TARGET_ARCH) -shared -o $@ $(OBJS) $(LIBS)
+
+clean:; rm -f ex.dll *.o
diff --git a/w32api/dirent.c b/w32api/dirent.c
index cbce017..188590e 100755
--- a/w32api/dirent.c
+++ b/w32api/dirent.c
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #include <windows.h>
 #include <stdlib.h>
 #include "dirent.h"
diff --git a/w32api/dirent.h b/w32api/dirent.h
index b88825a..44c0c10 100755
--- a/w32api/dirent.h
+++ b/w32api/dirent.h
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #include <windows.h>
 
 typedef struct DIR_tag DIR;
diff --git a/w32api/ex.c b/w32api/ex.c
index 5e22fdf..d9c7295 100755
--- a/w32api/ex.c
+++ b/w32api/ex.c
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
diff --git a/w32api/pusherror.c b/w32api/pusherror.c
index 9b661b9..7ae7f5c 100755
--- a/w32api/pusherror.c
+++ b/w32api/pusherror.c
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #include <stdio.h> /* sprintf() */
 #include <ctype.h>
 #define WIN32_LEAN_AND_MEAN 1
diff --git a/w32api/pusherror.h b/w32api/pusherror.h
index 9105332..6d656de 100755
--- a/w32api/pusherror.h
+++ b/w32api/pusherror.h
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #ifndef pusherror_h
 #define pusherror_h
 
diff --git a/w32api/spawn.c b/w32api/spawn.c
index 1f099c7..7c13c1f 100755
--- a/w32api/spawn.c
+++ b/w32api/spawn.c
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #include <stdlib.h>
 #include <windows.h>
 #include <io.h>
diff --git a/w32api/spawn.h b/w32api/spawn.h
index 30caf56..bff6feb 100755
--- a/w32api/spawn.h
+++ b/w32api/spawn.h
@@ -1,3 +1,8 @@
+/*
+ * "ex" API implementation
+ * http://lua-users.org/wiki/ExtensionProposal
+ * Copyright 2007 Mark Edgar < medgar at student gc maricopa edu >
+ */
 #ifndef SPAWN_H
 #define SPAWN_H