From b6f16843598be062e4cfc448b38be8dfd2e4501d Mon Sep 17 00:00:00 2001
From: Martin Pulec <martin.pulec@cesnet.cz>
Date: Wed, 8 Nov 2023 15:05:19 +0100
Subject: [PATCH] fixed new zfec still crashing in Win

imroves 2af4ace25 fix, which didn't work for Windows, since the compiler
here doesn't accept include with absolute path:
```
tst.c:4:10: fatal error: '/usr/local/src/zfec/fec.h' file not found
    4 | #include "/usr/local/src/zfec/fec.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
```

(neither <> syntax works)
---
 configure.ac | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 4df951ccd..5b2cf4caa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2685,13 +2685,16 @@ if test $cross_compile = no; then
                 AC_CHECK_FILES([$ZFEC_PREFIX/fec.c $ZFEC_PREFIX/fec.h], [found_zfec=yes])
         fi
         if test "$found_zfec" = yes; then
-                AC_MSG_CHECKING([fec_init declaration in $ZFEC_PREFIX/fec.h])
+                S_CFLAGS=$CFLAGS
+                CFLAGS="$CFLAGS -I$ZFEC_PREFIX"
+                AC_MSG_CHECKING([fec_init declaration in fec.h])
                 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-                                   #include "$ZFEC_PREFIX/fec.h"
+                                   #include "fec.h"
                                    ]],
                                    [[
                                     #pragma GCC diagnostic error "-Wimplicit-function-declaration"
                                     fec_init();]])], fec_init=yes, fec_init=no)
+                CFLAGS=$S_CFLAGS
                 if test "$fec_init" = yes; then
                         AC_DEFINE([HAVE_FEC_INIT], [1], [fec_init must be called before fec_new])
                 fi