From 24d17220a1a11410c980c784b729f4466ab11f3b Mon Sep 17 00:00:00 2001
From: Ray Donnelly <mingw.android@gmail.com>
Date: Tue, 8 Dec 2015 23:17:06 +0000
Subject: libelf: Cygwin fix for UNC paths

If destdir was / and prefix began with /
then we would attempt to install libelf
to a path beginning with // which is a
UNC path on Cygwin. This is generally
incorrect.

Signed-off-by: Ray Donnelly <mingw.android@gmail.com>

diff --git a/scripts/build/companion_libs/200-libelf.sh b/scripts/build/companion_libs/200-libelf.sh
index 58aa315..529bba2 100644
--- a/scripts/build/companion_libs/200-libelf.sh
+++ b/scripts/build/companion_libs/200-libelf.sh
@@ -135,6 +135,13 @@ do_libelf_backend() {
     CT_DoExecLog ALL ${make}
 
     CT_DoLog EXTRA "Installing libelf"
+
+    # Guard against $destdir$prefix == //
+    # which is a UNC path on Cygwin/MSYS2
+    if [[ ${destdir} == / ]] && [[ ${prefix} == /* ]]; then
+        destdir=
+    fi
+
     CT_DoExecLog ALL ${make} instroot="${destdir}" install
 }
 
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