Build Unix-friendly versions directly from library.
diff --git a/unix/mkfile.regexp b/unix/mkfile.regexp
new file mode 100644
index 0000000..de81308
--- /dev/null
+++ b/unix/mkfile.regexp
@@ -0,0 +1,44 @@
+MAKEALL=`{cd ../make; ls Make.*}
+TARG=\
+ $MAKEALL\
+ NOTICE\
+ README\
+ Makefile\
+ regexp9.3\
+ regexp9.7\
+ regexp9.h\
+ regcomp.h\
+ lib9.h\
+ `{ls -p $PLAN9/src/libregexp/*.c}\
+
+all:V: $TARG
+
+%: $PLAN9/include/%
+ cp $prereq $target
+
+%: $PLAN9/src/libregexp/%
+ cp $prereq $target
+
+%: $PLAN9/man/man1/%
+ cp $prereq $target
+
+%: $PLAN9/man/man3/%
+ cp $prereq $target
+
+%: $PLAN9/man/man7/%
+ cp $prereq $target
+
+%: ../make/%
+ cp $prereq $target
+
+Makefile:D: ../make/Makefile.TOP ../make/Makefile.regexp ../make/Makefile.LIB ../make/Makefile.BOT
+ cat $prereq >$target
+
+README: ../README
+ cp $prereq $target
+
+NOTICE: ../NOTICE.regexp
+ cp $prereq $target
+
+lib9.h: $PLAN9/src/libregexp/lib9.h
+ cp $prereq $target
