commit https://github.com/vim/vim/commit/e8aee7dcf9b12becff86e8ce1783a86801c5f9f6 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Apr 26 21:39:13 2016 +0200 patch 7.4.1793 Problem: Some character classes may differ between systems. On OS/X the regexp test fails. Solution: Make this less dependent on the system. (idea by Kazunobu Kuriyama)

# The most simplistic Makefile, for MinGW and Cygwin gcc on MS-DOS

ifndef USEDLL
USEDLL = no
endif

ifeq (yes, $(USEDLL))
DEFINES =
LIBS    = -lc
else
DEFINES =
LIBS    =
endif

CC = gcc
CFLAGS = -O2 -Wall -DWIN32 $(DEFINES)

ifneq (sh.exe, $(SHELL))
DEL = rm
else
DEL = del
endif

xxd.exe: xxd.c
	$(CC) $(CFLAGS) -s -o xxd.exe xxd.c $(LIBS)

clean:
	-$(DEL) xxd.exe