--- configure.ac.orig	2018-11-01 20:35:12 UTC
+++ configure.ac
@@ -74,10 +74,6 @@ if test "x-$want_mio_debug" = "x-yes" ; then
     AC_DEFINE(MIO_DEBUG,1,[Define to 1 if you want to enable managed IO debug output.])
 fi
 
-# Colorized build output
-AX_CHECK_COMPILE_FLAG([-fdiagnostics-color], [CFLAGS="${CFLAGS} -fdiagnostics-color"],
-    [AX_CHECK_COMPILE_FLAG([-fcolor-diagnostics], [CFLAGS="${CFLAGS} -fcolor-diagnostics"])])
-
 # Two-step header checking.  First check for headers which don't
 # require any other headers.
 AC_HEADER_DIRENT
@@ -396,15 +392,39 @@ fi
 #
 # optional libs
 
-# OpenSSL >= 1.0.2
-AC_ARG_ENABLE(ssl, AC_HELP_STRING([--enable-ssl], [enable SSL/TLS support (yes)]), want_ssl=$enableval, want_ssl=yes)
-AS_IF([test "x$want_ssl" = "xyes"], [
-	PKG_CHECK_MODULES(SSL, openssl >= 1.0.2,
-		have_ssl="yes"
+# OpenSSL >= 1.0.1
+AC_ARG_ENABLE(ssl, AC_HELP_STRING([--enable-ssl[=DIR]], [enable SSL/TLS support (yes)]), want_ssl=$enableval, want_ssl=yes)
+if test "x-$want_ssl" != "x-no" ; then
+    if test "x-$want_ssl" != "x-yes" ; then
+        CFLAGS="$CFLAGS -I$enableval/include" 
+        CPPFLAGS="$CPPFLAGS -I$enableval/include" 
+        LDFLAGS="$LDFLAGS -L$enableval/lib"
+    fi
+    AC_CHECK_HEADERS(openssl/crypto.h)
+    if test "x-$ac_cv_header_openssl_crypto_h" = "x-yes" ; then
+        AC_CHECK_LIB(crypto, HMAC_Update)
+    fi
+    if test "x-$ac_cv_lib_crypto_HMAC_Update" = "x-yes" ; then
+        AC_CHECK_HEADERS(openssl/ssl.h)
+    fi
+    if test "x-$ac_cv_header_openssl_ssl_h" = "x-yes" ; then
+        AC_CHECK_LIB(ssl, SSL_connect)
+    fi
+    if test "x-$ac_cv_lib_ssl_SSL_connect" = "x-yes" ; then
+        AC_MSG_CHECKING(for OpenSSL version >= 1.0.1)
+        AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <openssl/crypto.h>]],
+                                       [[return !(SSLeay() >= 0x010001000L)]])],
+                      [AC_MSG_RESULT(yes)
+                       have_openssl=yes],
+                      AC_MSG_RESULT(no))
+    fi
+    if test "x-$have_openssl" != "x-yes" ; then
+        AC_MSG_ERROR([OpenSSL >= 1.0.1 not found])
+    fi
+
     AC_DEFINE(HAVE_SSL,1,[Define to 1 if OpenSSL is available.])
-	)
-])
-AM_CONDITIONAL(HAVE_SSL, [test "x$have_ssl" = "xyes"])
+fi
+AM_CONDITIONAL(HAVE_SSL, [test "x-$have_openssl" = "x-yes"])
 
 dnl Check for & handle argument to --with-zlib.
 _cppflags=$CPPFLAGS