From 1437556645417e6302862845e7ebcbd4c9908357 Mon Sep 17 00:00:00 2001
From: Martin Schanzenbach <mschanzenbach@posteo.de>
Date: Sun, 5 Jul 2020 15:21:55 +0200
Subject: build: fix libidn2 detection if prefix given (#5948)

---
 configure.ac | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 6dc914c12..18c309aca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1160,8 +1160,12 @@ AS_IF([test x_$withval = x_yes],
                                          my_with_libidn2=0]))],
       [AS_IF([test x_$withval != x_no],
              [CFLAGS="$CFLAGS -I$withval/include"
-              LDFLAGS="$LDFLAGS -L$withval/lib"],
-	          [my_with_libidn2=0])])
+              LDFLAGS="$LDFLAGS -L$withval/lib"
+              AC_CHECK_HEADERS([idn2/idn2.h],
+                               AC_MSG_NOTICE([Found idn2/idn2.h]),
+                               [AC_MSG_NOTICE([Failed to find idn2.h])
+                               my_with_libidn2=0])],
+             [my_with_libidn2=0])])
 
 AC_MSG_CHECKING([if libidn can be used])
 # Check for LIBIDNs
-- 
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