To get from 'dislike' to 'like', I used this:

$ cd /opt/local/var/macports/sources/rsync.macports.org/release/ports/devel/lua-luasocket/
$ grep patchfiles Portfile
patchfiles          patch-config.diff patch-makefile.diff patch-src-makefile.diff

$ cat files/patch-makefile.diff files/patch-src-makefile.diff

--- makefile.old        2007-10-14 21:21:05.000000000 -0700
+++ makefile    2012-06-07 12:58:32.000000000 -0700
@@ -41,6 +41,7 @@
        cd src; $(INSTALL_DATA) $(TO_SOCKET_SHARE) $(INSTALL_SOCKET_SHARE)
        cd src; mkdir -p $(INSTALL_SOCKET_LIB)
        cd src; $(INSTALL_EXEC) $(SOCKET_SO) $(INSTALL_SOCKET_LIB)/core.$(EXT)
+       cd src; $(INSTALL_EXEC) $(UNIX_SO) $(INSTALL_SOCKET_LIB)/unix.$(EXT)
        #cd src; mkdir -p $(INSTALL_MIME_SHARE)
        #cd src; $(INSTALL_DATA) $(TO_MIME_SHARE) $(INSTALL_MIME_SHARE)
        cd src; mkdir -p $(INSTALL_MIME_LIB)
--- src/makefile.old    2012-06-07 12:40:16.000000000 -0700
+++ src/makefile        2012-06-07 12:40:34.000000000 -0700
@@ -47,7 +47,7 @@
        usocket.o \
        unix.o
 
-all: $(SOCKET_SO) $(MIME_SO) 
+all: $(SOCKET_SO) $(MIME_SO) $(UNIX_SO)
 
 $(SOCKET_SO): $(SOCKET_OBJS)
        $(LD) $(LDFLAGS) -o $@ $(SOCKET_OBJS)