Call it NO_IPV6 rather than hard-coding __CYGWIN__

Makefile

@@ -29,6 +29,8 @@
 #
 # Define WITH_OWN_SUBPROCESS_PY if you want to use with python 2.3.
 #
+# Define NO_IPV6 if you lack IPv6 support and getaddrinfo().
+#
 # Define COLLISION_CHECK below if you believe that SHA1's
 # 1461501637330902918203684832716283019655932542976 hashes do not give you
 # sufficient guarantee that no collisions between objects will ever happen.
@@ -97,7 +99,11 @@ SCRIPT_PYTHON = \
 # The ones that do not have to link with lcrypto nor lz.
 SIMPLE_PROGRAMS = \
 	git-get-tar-commit-id git-mailinfo git-mailsplit git-stripspace \
-	git-daemon git-var
+	git-var
+ifndef NO_IPV6
+# Not supported to IPv6-challenged platforms yet
+SIMPLE_PROGRAMS += git-daemon
+endif
 
 # ... and all the rest
 PROGRAMS = \
@@ -175,6 +181,7 @@ endif
 ifeq ($(shell uname -o),Cygwin)
 	NO_STRCASESTR = YesPlease
 	NEEDS_LIBICONV = YesPlease
+	NO_IPV6 = YesPlease
 endif
 ifneq (,$(findstring arm,$(shell uname -m)))
 	ARM_SHA1 = YesPlease
@@ -231,6 +238,9 @@ ifdef NO_STRCASESTR
 	DEFINES += -Dstrcasestr=gitstrcasestr
 	LIB_OBJS += compat/strcasestr.o
 endif
+ifdef NO_IPV6
+	DEFINES += -DNO_IPV6
+endif
 
 ifdef PPC_SHA1
 	SHA1_HEADER = "ppc/sha1.h"

connect.c

@@ -290,7 +290,7 @@ static enum protocol get_protocol(const char *name)
 #define STR_(s)	# s
 #define STR(s)	STR_(s)
 
-#ifndef __CYGWIN__
+#ifndef NO_IPV6
 
 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
 {
@@ -348,7 +348,7 @@ static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
 	return 0;
 }
 
-#else /* __CYGWIN__ */
+#else /* NO_IPV6 */
 
 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
 {
@@ -417,7 +417,7 @@ static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
 	return 0;
 }
 
-#endif /* __CYGWIN__ */
+#endif /* NO_IPV6 */
 
 /*
  * Yeah, yeah, fixme. Need to pass in the heads etc.