diff --git cctools/configure.ac cctools/configure.ac
index 56e8f24..5219e3d 100644
--- cctools/configure.ac
+++ cctools/configure.ac
@@ -49,7 +49,8 @@ case $host_os in
   ;;
   cygwin* )
     iscygwin=yes
-    EXTRAFLAGS="-D__LARGE64_FILES -fno-PIC"
+    # https://github.com/tpoechtrager/osxcross/issues/87
+    EXTRAFLAGS="-D__LARGE64_FILES -D_GNU_SOURCE -fno-PIC"
     WARNINGS="-Wno-attributes"
     XCC="gcc"
     XCXX="g++"
diff --git cctools/include/foreign/machine/endian.h cctools/include/foreign/machine/endian.h
index 6cf3901..0920fd6 100644
--- cctools/include/foreign/machine/endian.h
+++ cctools/include/foreign/machine/endian.h
@@ -28,7 +28,8 @@
 /*
  * Copyright 1995 NeXT Computer, Inc. All rights reserved.
  */
-#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
+#if defined(__FreeBSD__)   || defined(__NetBSD__) || defined(__OpenBSD__) || \
+    defined(__DragonFly__) || defined(__CYGWIN__)
 #include_next <machine/endian.h>
 #else
 #ifndef _BSD_MACHINE_ENDIAN_H_
@@ -45,4 +46,5 @@
 #endif

 #endif /* _BSD_MACHINE_ENDIAN_H_ */
-#endif /* __FreeBSD__ || __NetBSD__ || __OpenBSD__ || __DragonFly__ */
+#endif /* __FreeBSD__   || __NetBSD__ || __OpenBSD__ ||
+          __DragonFly__ || __CYGWIN__ */
diff --git usage_examples/ios_toolchain/wrapper.c usage_examples/ios_toolchain/wrapper.c
index c102d79..b88d35a 100644
--- usage_examples/ios_toolchain/wrapper.c
+++ usage_examples/ios_toolchain/wrapper.c
@@ -85,7 +85,8 @@ char *get_executable_path(char *epath, size_t buflen)
     if (!ok) return NULL;
     l = strlen(epath);
 #else
-    ssize_t l = readlink("/proc/self/exe", epath, buflen);
+    ssize_t l = readlink("/proc/self/exe", epath, buflen - 1);
+    if (l > 0) epath[l] = '\0';
 #endif
     if (l <= 0) return NULL;
     epath[buflen - 1] = '\0';
--- cctools/configure
+++ cctools/configure
@@ -2627,7 +2627,8 @@
   ;;
   cygwin* )
     iscygwin=yes
-    EXTRAFLAGS="-D__LARGE64_FILES -fno-PIC"
+    # https://github.com/tpoechtrager/osxcross/issues/87
+    EXTRAFLAGS="-D__LARGE64_FILES -D_GNU_SOURCE -fno-PIC"
     WARNINGS="-Wno-attributes"
     XCC="gcc"
     XCXX="g++"