From ffd0c982a572094debe37d12faea6ddf3b0eb31c Mon Sep 17 00:00:00 2001
From: Viktor Szakats <commit@vsz.me>
Date: Thu, 2 Jan 2025 11:43:13 +0100
Subject: [PATCH] configure: fix `--without-lib*-prefix` when `lib*` is
 detected anyway

Do not test the prefix when set to `no`.
(as with `--without-lib*-prefix`)

Before this patch this test was always made and when detected despite
the wrong prefix, the `no` prefix remained in `LDFLAGS` causing a build
failure later in `libtool`.

Fixes:
```
$ ../configure --without-libssl-prefix
[...]
../libtool: line 7756: cd: no/lib: No such file or directory
libtool:   error: cannot determine absolute directory name of 'no/lib'
make[2]: *** [libssh2.la] Error 1
```

Follow-up to d19b61907039554b8261a90898f2f31e1a706f38 #1384

Reported-by: Christoph Reiter
Fixes #1505
Closes #1506
---
 acinclude.m4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/acinclude.m4 b/acinclude.m4
index d88309e7..0ec6449b 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -838,7 +838,7 @@ AC_DEFUN([LIBSSH2_LIB_HAVE_LINKFLAGS], [
   libssh2_save_CPPFLAGS="$CPPFLAGS"
   libssh2_save_LDFLAGS="$LDFLAGS"
 
-  if test "${with_lib$1_prefix+set}" = set; then
+  if test "${with_lib$1_prefix+set}" = set -a "${with_lib$1_prefix}" != 'no'; then
     CPPFLAGS="$CPPFLAGS${CPPFLAGS:+ }-I${with_lib$1_prefix}/include"
     LDFLAGS="$LDFLAGS${LDFLAGS:+ }-L${with_lib$1_prefix}/lib"
   fi