diff -ru emacs-26.1.orig/configure emacs-26.1/configure

--- emacs-26.1.orig/configure	2018-05-25 17:30:58.000000000 +0200

+++ emacs-26.1/configure	2018-11-28 19:48:51.524844347 +0100

@@ -4766,6 +4766,11 @@

     opsys=gnu-linux

   ;;

+  ## Midipix ports

+  *-*-midipix* )

+    opsys=midipix

+  ;;

+

   ## FreeBSD ports

   *-*-freebsd* )

     opsys=freebsd

@@ -9158,6 +9163,7 @@

 test "x$CANNOT_DUMP" = "x" && CANNOT_DUMP=no

 case "$opsys" in

   nacl) CANNOT_DUMP=yes ;;

+  midipix) CANNOT_DUMP=yes ;;

 esac

 if test "$CANNOT_DUMP" = "yes"; then

@@ -9768,7 +9774,7 @@

   fi

             if test x$have_sound_header = xyes || test $HAVE_ALSA = yes; then

      case "$opsys" in

-                     gnu-linux|freebsd|netbsd|mingw32|cygwin)

+                     gnu-linux|freebsd|netbsd|mingw32|cygwin|midipix)

 $as_echo "#define HAVE_SOUND 1" >>confdefs.h

@@ -11412,7 +11418,7 @@

   ## #ifdef DOUG_LEA_MALLOC; #undef REL_ALLOC; #endif

   ## Does the AC_FUNC_MMAP test below make this check unnecessary?

   case "$opsys" in

-    mingw32|gnu*) REL_ALLOC=no ;;

+    mingw32|midipix|gnu*) REL_ALLOC=no ;;

   esac

 fi

@@ -11422,7 +11428,7 @@

 use_mmap_for_buffers=no

 case "$opsys" in

-  mingw32) use_mmap_for_buffers=yes ;;

+  mingw32|midipix) use_mmap_for_buffers=yes ;;

 esac

@@ -15365,7 +15371,7 @@

 esac

 if test "${with_modules}" != "no"; then

   case $opsys in

-    gnu|gnu-linux)

+    gnu|gnu-linux|midipix)

       LIBMODULES="-ldl"

       HAVE_MODULES=yes

       ;;

@@ -16764,7 +16770,7 @@

   case $opsys in

     aix4-2) mail_lock="lockf" ;;

-    gnu|freebsd|dragonfly|netbsd|openbsd|darwin) mail_lock="flock" ;;

+    gnu|midipix|freebsd|dragonfly|netbsd|openbsd|darwin) mail_lock="flock" ;;

     ## On GNU/Linux systems, both methods are used by various mail programs.

     ## I assume most people are using newer mailers that have heard of flock.

@@ -18510,7 +18516,7 @@

 case $opsys in

-  cygwin|gnu|gnu-linux|gnu-kfreebsd|freebsd|netbsd|openbsd)

+  cygwin|midipix|gnu|gnu-linux|gnu-kfreebsd|freebsd|netbsd|openbsd)

 $as_echo "#define NARROWPROTO 1" >>confdefs.h

@@ -18550,7 +18556,7 @@

     ;;

-  gnu-linux | gnu-kfreebsd | dragonfly | freebsd | netbsd | darwin | nacl )

+  gnu-linux | midipix | gnu-kfreebsd | dragonfly | freebsd | netbsd | darwin | nacl )

         if test "x$ac_cv_func_grantpt" = xyes; then

 $as_echo "#define UNIX98_PTYS 1" >>confdefs.h

@@ -18620,7 +18626,7 @@

 case $opsys in

-    aix4-2 | cygwin | gnu | dragonfly | freebsd | netbsd | openbsd | darwin )

+    aix4-2 | cygwin | midipix | gnu | dragonfly | freebsd | netbsd | openbsd | darwin )

     $as_echo "#define SIGNALS_VIA_CHARACTERS 1" >>confdefs.h

     ;;

Only in emacs-26.1/lib: .binary-io.h.swp

diff -ru emacs-26.1.orig/lib-src/Makefile.in emacs-26.1/lib-src/Makefile.in

--- emacs-26.1.orig/lib-src/Makefile.in	2018-04-23 16:17:42.000000000 +0200

+++ emacs-26.1/lib-src/Makefile.in	2018-11-28 19:25:21.901162314 +0100

@@ -388,8 +388,12 @@ profile${EXEEXT}: ${srcdir}/profile.c $(NTLIB) $(config_h)

 	$(AM_V_CCLD)$(CC) ${ALL_CFLAGS} $< \

 	  $(NTLIB) $(LOADLIBES) $(LIB_CLOCK_GETTIME) -o $@

-make-docfile${EXEEXT}: ${srcdir}/make-docfile.c $(NTLIB) $(config_h)

-	$(AM_V_CCLD)$(CC) ${ALL_CFLAGS} $< $(NTLIB) $(LOADLIBES) -o $@

+make-docfile${EXEEXT}: CFLAGS_FOR_BUILD += -std=gnu99

+make-docfile${EXEEXT}: CFLAGS_FOR_BUILD += -I../src

+make-docfile${EXEEXT}: CFLAGS_FOR_BUILD += -I${srcdir}/../src -I${srcdir}/../lib

+make-docfile${EXEEXT}: CFLAGS_FOR_BUILD += -D_BINARY_H -Dset_binary_mode\(x\,y\)

+make-docfile${EXEEXT}: ${srcdir}/make-docfile.c $(config_h)

+	$(AM_V_CCLD)$(BUILDCC) $< -o $@ $(CFLAGS_FOR_BUILD)

 movemail${EXEEXT}: ${srcdir}/movemail.c pop.o $(NTLIB) $(config_h)

 	$(AM_V_CCLD)$(CC) ${ALL_CFLAGS} ${MOVE_FLAGS} $< pop.o \