From https://github.com/dillo-browser/dillo/pull/414
From: "Azamat H. Hackimov" <azamat.hackimov@gmail.com>
Date: Sat, 28 Jun 2025 16:28:54 +0300
Subject: [PATCH] Add options to search custom MbedTLS installations

Some Linux distributions (like Gentoo or Arch) allows to install
MbedTLS 2.x and 3.x branches simultaneously. This change helps to
inding custom MbedTLS locations.

Signed-off-by: Azamat H. Hackimov <azamat.hackimov@gmail.com>
--- a/configure.ac
+++ b/configure.ac
@@ -21,6 +21,14 @@ AC_ARG_WITH([jpeg-inc],
   [AS_HELP_STRING([--with-jpeg-inc=DIR], [Specify where to find libjpeg headers])],
   LIBJPEG_INCDIR=$withval)
 
+AC_ARG_WITH([mbedtls-lib],
+  [AS_HELP_STRING([--with-mbedtls-lib=DIR], [Specify where to find MbedTLS libraries])],
+  [LDFLAGS="$LDFLAGS -L$withval"])
+
+AC_ARG_WITH([mbedtls-inc],
+  [AS_HELP_STRING([--with-mbedtls-inc=DIR], [Specify where to find MbedTLS headers])],
+  [CFLAGS="$CFLAGS -I$withval" CXXFLAGS="$CXXFLAGS -I$withval"])
+
 AC_ARG_ENABLE([efence],
   [AS_HELP_STRING([--enable-efence], [Try to compile and run with Electric Fence])],
   [enable_efence=$enableval],
@@ -489,17 +497,20 @@ if test "x$enable_tls" = "xyes"; then
       dnl If the headers are found, try to link with mbedTLS
       if test "x$mbedtls_ok" = "xyes"; then
         old_libs="$LIBS"
-        AC_CHECK_LIB(mbedtls, mbedtls_ssl_init, mbedtls_ok=yes, mbedtls_ok=no, -lmbedx509 -lmbedcrypto)
+        AC_SEARCH_LIBS(mbedtls_ssl_init, [mbedtls-3 mbedtls], mbedtls_ok=yes, mbedtls_ok=no)
+        AC_SEARCH_LIBS(mbedtls_pk_get_name, [mbedcrypto-3 mbedcrypto], mbedcrypto_ok=yes, mbedcrypto_ok=no)
+        AC_SEARCH_LIBS(mbedtls_x509_crt_init, [mbedx509-3 mbedx509], mbedx509_ok=yes, mbedx509_ok=no)
         LIBS="$old_libs"
       fi
 
       dnl If it went good, use it, otherwise disable TLS support
-      if test "x$mbedtls_ok" = "xyes"; then
+      if test "x$mbedtls_ok" = "xyes" && test "x$mbedcrypto_ok" = "xyes" && test "x$mbedx509_ok" = "xyes" ; then
         AC_MSG_NOTICE([Using mbedTLS as TLS library.])
         tls_impl="mbedTLS"
         AC_DEFINE([HAVE_MBEDTLS], [1], [mbedTLS works])
-        LIBSSL_LIBS="-lmbedtls -lmbedx509 -lmbedcrypto"
+        LIBSSL_LIBS="$ac_cv_search_mbedtls_ssl_init $ac_cv_search_mbedtls_pk_get_name $ac_cv_search_mbedtls_x509_crt_init"
       else
+        mbedtls_ok=no
         AC_MSG_NOTICE([Cannot find mbedTLS])
       fi
     fi