diff -Naur a/Makefile.in b/Makefile.in
--- a/Makefile.in	2014-07-20 20:19:48.636200000 +0400
+++ b/Makefile.in	2014-07-20 20:19:51.771800000 +0400
@@ -630,7 +630,7 @@
 	lib/areadlinkat.c lib/argmatch.c lib/argv-iter.c \
 	lib/argv-iter.h lib/backupfile.c lib/base64.h lib/base64.c \
 	lib/bitrotate.h lib/bitrotate.c lib/buffer-lcm.c \
-	lib/buffer-lcm.h lib/c-ctype.h lib/c-ctype.c lib/c-strcase.h \
+	lib/buffer-lcm.h lib/cygwin.c lib/cygwin.h lib/c-ctype.h lib/c-ctype.c lib/c-strcase.h \
 	lib/c-strcasecmp.c lib/c-strncasecmp.c lib/c-strtod.c \
 	lib/c-strtold.c lib/canon-host.c lib/canonicalize.c \
 	lib/careadlinkat.c lib/cloexec.c lib/close-stream.c \
@@ -710,7 +710,7 @@
 	lib/areadlinkat.$(OBJEXT) lib/argmatch.$(OBJEXT) \
 	lib/argv-iter.$(OBJEXT) lib/backupfile.$(OBJEXT) \
 	lib/base64.$(OBJEXT) lib/bitrotate.$(OBJEXT) \
-	lib/buffer-lcm.$(OBJEXT) lib/c-ctype.$(OBJEXT) \
+	lib/buffer-lcm.$(OBJEXT) lib/cygwin.$(OBJEXT) lib/c-ctype.$(OBJEXT) \
 	lib/c-strcasecmp.$(OBJEXT) lib/c-strncasecmp.$(OBJEXT) \
 	lib/c-strtod.$(OBJEXT) lib/c-strtold.$(OBJEXT) \
 	lib/canon-host.$(OBJEXT) lib/canonicalize.$(OBJEXT) \
@@ -4174,7 +4174,7 @@
 	lib/areadlinkat.c lib/argmatch.c lib/argv-iter.c \
 	lib/argv-iter.h lib/backupfile.c lib/base64.h lib/base64.c \
 	lib/bitrotate.h lib/bitrotate.c lib/buffer-lcm.c \
-	lib/buffer-lcm.h lib/c-ctype.h lib/c-ctype.c lib/c-strcase.h \
+	lib/buffer-lcm.h lib/cygwin.c lib/cygwin.h lib/c-ctype.h lib/c-ctype.c lib/c-strcase.h \
 	lib/c-strcasecmp.c lib/c-strncasecmp.c lib/c-strtod.c \
 	lib/c-strtold.c lib/canon-host.c lib/canonicalize.c \
 	lib/careadlinkat.c lib/cloexec.c lib/close-stream.c \
@@ -5849,6 +5849,8 @@
 	lib/$(DEPDIR)/$(am__dirstamp)
 lib/buffer-lcm.$(OBJEXT): lib/$(am__dirstamp) \
 	lib/$(DEPDIR)/$(am__dirstamp)
+lib/cygwin.$(OBJEXT): lib/$(am__dirstamp) \
+	lib/$(DEPDIR)/$(am__dirstamp)
 lib/c-ctype.$(OBJEXT): lib/$(am__dirstamp) \
 	lib/$(DEPDIR)/$(am__dirstamp)
 lib/c-strcasecmp.$(OBJEXT): lib/$(am__dirstamp) \
diff -Naur a/src/install.c b/src/install.c
--- a/src/install.c	2014-07-20 20:19:43.269800000 +0400
+++ b/src/install.c	2014-07-20 20:19:51.803000000 +0400
@@ -44,7 +44,7 @@
 #include "utimens.h"
 #include "xstrtol.h"
 
-#if __CYGWIN__
+#ifdef __CYGWIN__
 # include "cygwin.h"
 #endif